HP 410C Service Manual

TM 11-6625-1614-15
b. Use ac voltmeter to verify Model 410C line
f. Observe counter, and adjust A3R5 for a chop-
voltage of 115 v. Chopper frequency will vary with
per frequency of 100 cps ( ±2 cps).
line voltage variations.
c. Connect 410C, electronic counter, and
5-29. Power Supply Adjustment
voltmeter as ahown in Figure 5-6.1.
a. Refer to Table 5-7 for Power Supply check
d. Set Model 410C FUNCTION SELECTOR to
points and typical voltage values. Measure dc
+DCV; RANGE to 1.5 V.
voltages between common and designated location
on Al.
e. Adjust voltmeter calibrator to supply + 5 V dc
b. Set Model 410C FUNCTION to ACV. Short
to the Model 410C (DCV and COM cables).
ACV and COM cable.
Table 5-7, Power Supply Test
voltage
Location on A7
Tolerance
+ 175 v
Wht/blk and Orange
±30V
+38V
Junction of CR6 and R4
±8.0 V
+6V
Cathode of CR8
±0.6 V
–9.1
V
Anode of CR7
+1.8V
c. Measure + 175 volt ac ripple with ac voltmeter
(H-P Model 3400A). RMS value of ripple should not
exceed 2.5 mv.
5-30. DC Zero Adjustment and Bias
a. Set Model 410C Function Selector to + DCV
and Range Switch to .5 V.
b. Short DCV Cable to COM Cable.
c. Adjust A3R21 fully counterclockwise, and
then rotate about 20° clockwise.
d. Adjust ZERO ADJ pot on rear panel for zero
meter deflection. Switch to – DCV. If any deflection
is observed, adjust ZERO ADJ pot to return meter
pointer halfway back to zero. Check zero setting on
all ranges for both + DCV and – DCV. Zero offset
should not exceed 1070 in any case.
5-31. DC Amplifier Output Adjust
a. Set the Model 410C FUNCTION SELECTOR
to ACV; RANGE to 5 V.
b. Connect a DC Voltmeter (H-P Model 3440A/
3442A) to the dc amplifier OUTPUT on the Model
410C rear panel. Set dc voltmeter RANGE to 10 v.
c. Connect Model 410C AC Probe to voltmeter
calibrator output. Adjust voltmeter calibrator to pro-
vide a 5 v, 400 cps signal.
d. Model 410C should read full scale (5 v). The
dc voltmeter should indicate 1.5 V. If it does not, ad-
just A6R20 for 1.5 v reading.
5-32. Full Scale DC Adjustment
a. Set Model 410C. FUNCTION SELECTOR to
+ DCV; RANGE to .015 V.
Change 1
5-9/(5-10 Blank)

HP 410C Specifications

General

Brand	HP
Model	410C
Category	Measuring Instruments
Language	English