Caen V993 Technisches Dokument

Technical

Information

Manual

MOD. V993

3 March 2004

Revision n.3

DUAL TIMER

MANUAL REV.3

NPO:

00114/00:V993x.MUTx/02

CAEN will repair or replace any product within the guarantee period if the Guarantor declares

that the product is defective due to workmanship or materials and has not been caused by

mishandling, negligence on behalf of the User, accident or any abnormal conditions or

operations.

CAEN declines all responsibility for damages or

injuries caused by an improper use of the Modules due

to negligence on behalf of the User. It is strongly

recommended to read thoroughly the CAEN User's

Manual before any kind of operation.

CAEN reserves the right to change partially or entirely the contents of this Manual at any time

and without giving any notice.

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User's Manual (MUT) Mod. V993 B Dual Timer 03/03/2004 3

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TABLE OF CONTENTS

1. MODULE DESCRIPTION ........................................................................................................................4

1.1. OVERVIEW .............................................................................................................................................4

2. TECHNICAL SPECIFICATIONS............................................................................................................5

2.1. PACKAGING............................................................................................................................................5

2.2. POWER REQUIREMENTS ..........................................................................................................................5

2.3. FRONT PANEL.........................................................................................................................................6

2.4. SIGNALS FEATURES ................................................................................................................................7

2.5. OTHER COMPONENTS .............................................................................................................................8

2.6. TECHNICAL SPECIFICATIONS TABLE........................................................................................................8

3. OPERATING MODES...............................................................................................................................9

3.1. INSTALLATION........................................................................................................................................9

3.2. TIMER TRIGGERING ................................................................................................................................9

3.3. OUTPUT WIDTH ADJUSTMENT...............................................................................................................10

3.4. OUTPUT LEVEL SELECTION...................................................................................................................10

3.5. LEDS OPERATION.................................................................................................................................10

LIST OF FIGURES

FIG. 2.1: MODEL V993 B FRONT PANEL ................................................................................................................6

LIST OF TABLES

TABLE 2.1: POWER REQUIREMENTS .......................................................................................................................5

TABLE 2.2 MOD. V993 B TECHNICAL FEATURES..................................................................................................8

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1.Module description

1.1. Overview

The Model V993 B Dual Timer is a 1-unit VME module housing two identical triggered

pulse generators.

The module produces NIM, TTL and ECL pulses whose width ranges from 50 ns to 10 s

when triggered. Output pulses are provided normal (OUT) and negated (/OUT).

Timers can be re-triggered with the end marker signal.

The coarse adjustment of the output width is provided via a 9-position rotary switch, the

fine adjustment can be performed via either a rotary handle or by providing an external

voltage (WSET).

The trigger START can be provided via either an external signal (NIM, TTL or ECL) or

manually via a front panel switch (START/RESET switch).

The VETO input (NIM, TTL or ECL TRUE level) allows to disable the START operation.

The ENDM output (NIM, TTL or ECL) is a short pulse produced at the end of any timing

cycle.

The RESET input (NIM, TTL or ECL) ends the timing cycle at any time. RESET can also

be provided manually via a front panel switch (START/RESET switch).

See § 2.4 for details about signals.

The module features LEMO 00 connectors for WSET and NIM/TTL signals and male pin

couples for ECL signals. Two front panel LEDs display when the module is operating.

The board is equipped with the P1 connector.

Two internal switches allow to select between NIM and TTL output pulses, while input

levels are automatically recognised (no selection is required).

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2.Technical specifications

2.1. Packaging

The Model V993 B is housed in a 6U-high, 1U-wide VME unit. The board hosts the VME

P1 connector.

2.2. Power requirements

The power requirements of the versions available for the V993 B module are as follows:

Table 2.1: Power requirements

+5 V 2.3 A

+12 V 60 mA

-12 V 300 mA

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2.3. Front panel

Fig. 2.1: Model V993 B front panel

DUAL TIMER

VETO

RESET

ENDM

OUT

/OUT

VETO

RESET

ENDM

OUT

/OUT

RESET

START

OUT

/OUT ENDM

OUT

/OUT ENDM

START VETO

WSET

1 µs

10 µs

.1 ms

1 ms 10 ms

10 s

1 s

.1 s

1 µs

10 µs

.1 ms

1 ms 10 ms

10 s

1 s

.1 s

- +

COARSE

ADJUSTMENT

FINE

ADJUSTMENT

WSET/FINE ADJUSTMENT

SWITCH

Mod. V993

START

RESET/START

SWITCH

0 - 5V

∞

R L

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2.4. Signals features1

START INPUT: Signal features:

NIM: Leading edge sensitive, 2.5 ns minimum FWHM on

LEMO 00 type connector

TTL: Leading edge sensitive, 1.5 ns minimum FWHM on

LEMO 00 type connector

ECL: Leading edge sensitive, 2.5 ns minimum FWHM on a

male pin-couple

START/RESET Switch2: Momentary switch for single cycle

operation

Function:

Timer triggering signal

VETO INPUT: Signal features:

NIM/TTL: TRUE level (within ±2 ns of START leading edge)

on LEMO 00 type connector

ECL: TRUE level (within ±2 ns of START leading edge) on a

male pin-couple

Function:

It disables triggering

RESET INPUT: Signal features:

NIM/TTL: Leading edge sensitive, 3 ns minimum FWHM on

LEMO 00 type connector

ECL: Leading edge sensitive, 3 ns minimum FWHM on a

male pin-couple

START/RESET Switch2: Momentary switch

Function:

It stops the timing cycle at any time. After a RESET the

module is at rest until the next START.

ENDM OUTPUT: Signal features:

NIM: 8 ns wide on LEMO 00 type connector

TTL: 10 ns wide on LEMO 00 type connector

ECL: 8 ns wide on a male pin-couple

Function:

It marks the end of the timing cycle

OUT: Signal features:

NIM: 50 ns to 10 s wide, 2 ns rise/fall time, Fan-Out of 2 on

LEMO 00 type connectors

TTL: 50 ns to 10 s wide, 4.5 ns rise/fall time, Fan-Out of 2 on

LEMO 00 type connectors

ECL: 50 ns to 10 s wide, 2 ns rise/fall time, male pin-couple

Function:

Output pulse

/OUT: Signal features:

NIM: 50 ns to 10 s wide, 2 ns rise/fall time, Fan-Out of 2 on

LEMO 00 type connectors

1All ECL inputs are 110 Ωterminated, all NIM/TTL inputs are 50 Ωterminated

2START and RESET share the same 3-position switch: Left →RESET, Middle →NEUTRAL

(stable), Right →START

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TTL: 50 ns to 10 s wide, 4.5 ns rise/fall time, Fan-Out of 2 on

LEMO 00 type connectors

ECL: 2 ns to 10 s wide, 2 ns rise/fall time, male pin-couple

Function:

Negated output pulse

WSET:Signal features:

0 to 5 V DC input on LEMO 00 type connector (1 kΩ input

impedance)

Function:

It allows to perform the output pulse fine adjustment via an

external voltage: 0 V →“short” pulse, 5 V →“long” pulse

N.B.: WSET must never exceed the 5 V value in order to avoid damage to the input

stage.

2.5. Other components

OPERATION LEDS:2 green/red LEDs (see § 3.5)

WSET/FINE ADJUSTMENT:Two 2-position switches (see § 3.3)

COARSE ADJUSTMENT:Two 9-position rotary switches (see § 3.3)

FINE ADJUSTMENT:Two rotary handles (see § 3.3)

2.6. Technical specifications table

Table 2.2 Mod. V993 B Technical Features

Packaging 1U-wide VME unit

Output3/ Section OUT: NIM/TTL signal with a Fan-Out of 2, ECL signal

/OUT: negated NIM/TTL signal, ECL signal

Output width 50 ns ÷ 10 s (NIM, TTL and ECL levels)

WSET 0 ÷ 5 V

START/OUT delay6<25 ns

RESET delay ~30 ns: the timing cycle stops ~30 ns after the RESET pulse is sent

Rise/Fall Time < 2 ns

Thermal stability4-60 ppm/°C

3NIM outputs drive a 50 Ω load (termination required), ECL outputs drive a 110 Ω load

(termination not required)

4Measured with a 1 µs NIM output pulse (1 ms full scale)

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3.Operating Modes

3.1. Installation

The V993 B board is provided with the P1 connector only, so it is suitable for both

standard VME 6U and VME V430 crates.

CAUTION

ECL INPUTS ARE SUSCEPTIBLE TO DAMAGE FROM ESD

(ELECTROSTATIC DISCHARGE). TO PREVENT THE RISK OF DAMAGING,

THE USER SHOULD NEUTRALIZE ANY STATIC ELECTRIC CHARGE BUILT UP

ON THE BODY (e.g. TOUCHING AN EARTHED OBJECT) BEFORE

HANDLING THE ECL CONNECTORS

CAUTION

ALL CABLES MUST BE REMOVED FROM THE FRONT PANEL BEFORE

EXTRACTING THE BOARD FROM THE CRATE!

3.2. Timer triggering

The board has two sections housing one triggered pulse generator each. Each section

produces an adjustable width pulse when triggered. The trigger START signal can be

sent as external NIM/ECL signal on the relevant START connectors or by pulling towards

right the START/RESET switch (see § 2.4). Note that output pulses are not retriggerable:

the START signal/switch is inactive as long as the output status is true.

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3.3. Output width adjustment

Each section has a 9-position rotary switch for performing the COARSE ADJUSTMENT

(see § 2.5). Actually this switch allows to choose between nine width ranges:

50 ns ÷ 1 µs

1 µs ÷ 10 µs

10 µs ÷ 0.1 ms

0.1 ms ÷ 1 ms

1 ms ÷ 10 ms

10 ms ÷ 0.1 s

0.1 s ÷ 1 s

1s ÷ 10 s

∞

: Flip-Flop

Actually the 9th position (∞) lets the module work as a Flip-Flop: the output is kept active

unless a Reset occurs. Once the COARSE ADJUSTMENT is set, the FINE

ADJUSTMENT must be performed either by turning the relevant rotary handle or by

supplying the WSET connector with a DC voltage ranging from 0 to 5 Volts: the

WSET/FINE ADJUSTMENT SWITCH allows to select between the two ways:

Left →WSET, Right →Rotary Handle (see § 2.5).

3.4. Output level selection

Two dip switches (one per section, named SW4 and SW8 respectively) allow to produce

either NIM or TTL pulses on the LEMO 00 output connectors. The switches’ setting is:

Dot NOT visible →NIM

Dot visible →TTL

Such swithces are placed on the printed board, close to the front panel. ECL output

pulses are produced in any case on the relevant male pins.

3.5. LEDs operation

The front panel LEDs are OFF when no output is present; they light up following the

output with widths larger than 0.5 s; they light up for a fixed time (≈0.5 s) with output

pulses shorter than 0.5 s. They flash at a constant frequency (≈2 Hz) with output

frequencies higher than 2 Hz. They light up red for NIM output pulses and green for TTL

ones.

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