Gain Values - Keithley 194 Instruction Manual

MAINTENANCE
7.8.8 Analog Circuitry Checks
The input amplifier circuitry processes input voltages, sup-
plying the necessary gain or attenuation, depending on
the selected range. Table 7-u outlines the basic procedure
for troubleshooting the analog circuitry. Gain values for
the four ranges are summarized in Table 7-14.
7.8.9 AID Converter Checks
The A/D converter transforms the analog input signal in-
to binary numbers representing its value at various points
in time. For sampling rates of 1OOkHz and slower, the AID
converter samples with 16.bit resolution. Above lOOkHz,
however, the converter resolution is only eight bits.
Table 7.15 summarizes the basic procedure for testing the
A/D converter module and associated circuitry.
7.8.10 A/D Board Digital Circuitry Checks
The digital circuitry located on the AiD board g:cncr.ttrs
signals to control the AID converter and transfer and stow
A/D data. Thus, problems with the digital circuity could
cause erratic operation. Check the variws compont'rrts
associated with digital circuitry using the prw~duw listed
in Table 7-16.
7-33