8
C. SPECIFICATIONS
PREAMPLIFIER
NEUTRALIZATION: 15 turn control located on probe. Range is 0 to 100
pF.
INPUT IMPEDANCE: Greater than 10,000 Megohms
INPUT CONNECTOR: Miniature co-axial slip-on
OUTPUT: 10 ohms impedance. 20 volt peak to peak,
BNC connector
GAIN: 50; 100; 200; 500; 1,000; 2,000; 5,000; or 10,000 ± 1%
OVERLOAD RECOVERY: Recovery is very fast, usually
one-half to a few milliseconds except for just after
STAIN. Recovery is then 20 to 40 seconds.
NOISE: Due to Amplifier and Source Resistance; (takes
into account current and voltage noise)
CALIBRATE GENERATOR: 100 uV ± 1%, Peak to Peak Square Wave. 150
Hz
LINE NOTCH FILTER: Standard 60 Hz. (optional 50 Hz.) The rejection ratio
is 200 to or, 46 dB.
HIGH FREQUENCY FILTER: Active 20 dB/decade, push button switch
selection 3 dB points are; 100, 300, 1K. 3K, 10K, 30K and 100K Hz.
LOW FREQUENCY FILTER: Active 20 dB/decade, push button switch
selection 3 dB points are 0.3, 1.0, 3.0, 10, 30, 100, and 300 Hz.
AUDIO MONITOR: An internal audio power amplifier monitors the
PREAMPLIFIER output. Sound level is controlled by the MONITOR control.
Output is through a phone jack located on rear panel. An 8 ohm speaker,
or external computer type powered amplifier is recommended.
CURRENT PUMP
PUMP LEVEL:
(1) EXTERNAL: An analog voltage between minus 10
to plus 10 volts into the EXT REF BNC jack generates
a current between minus 1000 nA to plus 1000 nA.
(2) INTERNAL: The INTERNAL position enables the 10
digital dial current setting. The dial is read out
in nA, and has a range of 0 to 1000 nA. Polarity is determined by
the PUMP POLARITY switch.
Z TEST: A signal 2 Hz 100mV per megohm
STAIN
A POSITIVE (for Metal electrodes) or NEGATIVE (for Glass electrodes)
voltage of 15 volts limited by 10,000 ohms is fed into the electrode.
ELECTRODE (PROBE MODE)
A four station push button switch selects the mode of operation by
connecting the probe input connector to the four functions via a reed relay
located in the probe. The four functions are:
