HP 3455A Operating And Service Manual page 161

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Table 8-E-1. inemonic Definitions.
P FF N
Poliarity
indicator | Specific Line
High True Indicator
Low True) .
Function
Indicator
High True AC (AC Enable)
High True Auto Cai 1(100 V, 1 kV Auto-Cal Constant [Cal Constant 4, 5, 6, 7])
High True Auto Cal 2
High True Analog DC 1 (.1 V, 1 V, 10 V Range and Ohms)
High True Analog DC 2 (100 V, 1 kV Range)
High True Analog DC 3 (1 k V Range)
High True A/D Zero (Enables or Resets A/D}
High True Input Ohms 1 (2 Wire Ohms Enable)
High True Input Ohms 2 (Connects 4 Wire and Current Source)
High True Input Ohms 3 (Ohms Ref Low Measurement)
High True Input Ohms 4 {1 K Reference Resistor Select [with HIO5])
High True Input Ohms 5 (.7 WA Current Source Select)
High True Input Ohms 6 (Ohms Current Source Enable)
High Measure AC 1 (Output from AC Converter Measured)
High True Measure Constant 1 (Measures Ohms, .1 V and 1 V Offsets [Cal
Constant 2, 3, 8, 9, 11])
High True Measure Constant 2 (Measures 10 V Gain [Cal Constant 10]}
High True Measure Constant 3 {1 kV Range Enable [Cal Constant 0, 1, 6])
High True Measure Constant 4 (Measures 1 V Gain [Cal Constant 0])
High True Measure OC 1 (100 V Range)
High True Measure DC 2 (.1 V 1 V, 10 V Range and Measure & Unk)
High True Measure Ohms 1 (Measure Ohms Ref, Range 100 K, 1 M, 10 M)
High True Measure Ohms 2 (Measure Ohms Ref, Range .1 K, 1 K 10 K)
High True Pre-Amp DC 1 (x 20 and x 100 Gain)
High True Pre-Amp DC 2 (x 1 Gain)
High True Pre-Amp DC 3 (x 10 Gain)
High True Pre-Amp Output (x 2 and x 20 Gain)
High True Positive:Rundown Fast (For Negative Input Voltage)
High True Positive Rundown Slow (For Negative Input Voltage)
High True Range 12 (Sets AC Converter Range 1, 10)
High True Range 24 (Sets AC Contertor Range 10, 100)
High True Range 34 (Sets AC Converter Range 100, 1000)
Low True AC Fast (AC Fast Enable)
Low True Auto Cal 3 (100 V, 1 kV Auto-Cal Constants [Cal Constant 4, 5, 6,
7)
Low True Auto-Cal {1 kV Range and 1 kp, 1 V Offset [Cal Constant 1, 6])
Low True Negative Rundown Fast (For A/D Positive Input Voltage)
Low True Negative Rundown Slow (For A/D Positive Input Voltage)
Low True Voltage Input (Enables A/D Input)
e. The clear line of A10U15 pin 1 should have an approximately + 5 V level. Troubleshoot U9,
U19, and their associated circuits.
Model 3455A SERVICE GROUP E Section VIII
8-71