HP 3455A - Page 161

Model 3455A
SERVICE GROUP E
Section VIII
Table 8-E-1. Mnemonic
Definitions.
P N
Poliarity
Indicator
— J
L
(H
=
High True
L
=
Low True)
Function
Indicator
Specific Line
Indicator
Mneumonic
HAC
HAC1
HAC2
HADl
HAD2
HAD3
High
High
High
High
High
High
HAZ
HI01
HI02
HIP3
HI04
HI05
HI06
High
High
High
High
High
High
High
Definilions
True
AC (AC
Enable)
True Auto
Cal 1(100 V,
1
kV Auto-Cal Constant (Cal Constant
4. 5,
6,
711
True Auto Cal 2
True Analog DC 1 (.1 V, 1 V, 10 V
Range and Ohms)
True Analog DC 2 (100 V, 1
kV
Range)
True
Analog DC 3 (1 k V
Range)
True A/D Zero
(Enables
or
Resets
A/D)
True
Input Ohms
1 (2
Wire Ohms Enable)
True input Ohms
2
(Connects 4 Wire and Current Source)
True Input Ohms 3 (Ohms Ref Low Measurement)
True Input
Ohms
4
(1 K
Reference Resistor Select
[with
HI05])
True Input Ohms
5
(.7 WA Current Source Select)
True Input Ohms
6
(Ohms Current Source Enable)
HMA1
HMC1
HMC2
HMC3
HMC4
HMD1
HMD2
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,
1
1 j)
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)1
High True Measure Constant 4 (Measures
1
V Gain [Cal Constant
0})
High True Measure DC
1 (100
V Rangel
High True Measure DC
2
(.1 V 1 V, 10 V Range and Measure & Unk)
HM01
HM02
HPD1
HPD2
HPD3
HP01
HPRF
HPRS
HR12
HR24
HR34
LACF
LAC3
LAC5
LNRF
LNRS
LVIN
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 1 2 (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,
71)
Low True Auto-Cal (1
kV Range
and 1
k^,
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/0 Positive Input Voltage)
Low
True Voltage Input (Enables A/D Input)
e.
The clear line of A10U15 pin I
should have an approximately + 5
V level. Troubleshoot
U9.
UI9, and their associated
circuits.
8-71