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MAINTEnJANCE
+5V
+lOV
-12V
-9V
+l2V
+275V
-275V
3 .
Display Zero.
a ) .
Place ZERO CHECK t o o f f .
b ) .
Select lV SENSITIVITY.
c ) .
Apply +5 millivolts d e ±1% using Voltage
Source (H) .
d ) .
Reading on Model 616 should be +0. 005 ±O
digits.
e) .
Adjust potentiometer R308 (DISPLAY ZERO)
as necessary.
4.
Rectifier Zero .
a) .
Select IV SENSITIVITY .
App�y -5 millivolts de ±l% using Voltage
b ) .
Source (H) .
c) .
Reading on Model 616 should be - 0 . 005
digits.
d ) .
Adj ust potentiometer RJOS (RECT. ZERO) as
necessary.
If an adjustment of potentiometer R30S is re
quired , repeat steps 3 and 4 until both read
ings are obtained without further adjustment .
5 .
+DC CAL.
a ) .
Select lV SENSITIVITY.
Apply +lV dc ± Q . 03% using Voltage Source
b ) .
( I ) .
Reading on Model 616 should be +1. 000 ±O
c) .
digit.
d ) .
Adj ust potent-iometer R309 (+DC CAL) as nec
essary.
The +DC CAL must be performed (in the order
given) before the -DC CAL to obtain proper
calibration.
6.
-DC CAL.
a) .
Select lV SENSITIVITY.
36
Power Supply Check
Test Point
TP4
±25 OmV
+10V Unreg.
+7 . 5V to
TP5
±60OmV
TP2
±45OmV
TP3
±60OmV
+27SV Dnreg.
+205 to
-27SV Unreg.
-205 to
NOTE
NOTE
TABLE 6- 7 .
Pk-to-Pk
Tolerance
<lmV
<lV
+l1V
<2mV
<4mV
<4mV
+300V
<3V
- 300V
<3V
b ) .
Apply -IV de ± O . 03% using Voltage Source
(I ) .
c) .
Reading on Model 616 should be - 1 . 000 ±o
digit.
d ) ,
Adj ust potentiometer R307 (-DC CAL) as
necessary.
7
lOMV RANGE
•
a ) .
Select lOmV SENSITIVITY.
b) .
Apply +10mV de ±O.03% using Voltage Source
(I)
(with 10 : 1 divider ) .
Reading on MOdel 616 should be +. 01000 ± l
c ) .
digit .
d) .
Adjust potentiometer R303 (IOmV RANGE ADJ . )
as necessary .
range of approx. -O�V to +lOO�V . )
±O
The front panel ZERO control may have to be
adjusted in ZERO CHECK prior to this adjust
ment to eliminate an error due to zero offset.
8 .
100V RANGE
a ) .
Select 100V SENSITIVITY.
b ) .
Apply +lOO . OV de ± 0 . 03% using Voltage
Source (I) .
c) .
Reading on Model 616 should be +lOO . OV
±l digit.
d ) .
Adj ust potentiometer R304 (lOOV RANGE
as necessary.
f .
Resistance Calibration.
1.
Select IV SENSITIVITY .
Select l0 5 Q range.
2 .
3 .
Apply a resistance o f 100 kilohms ± 0 . 02 % .
4 .
Reading on the Model 616 should be 1 . 000 x
10 5 0 ±O digit.
S.
Adjust potentiometer Rll4 (OHMS CAL) as nec
essary.
Line Regulation
90V - l25V AC
±l OmV
Unregulated
±lOmV
±150mV
±lOmV
Unregulated
Unregulated
ADJ.
(This control has an adjustment
NOTE
ADJ .
MODEL 616
ADJ�
1175
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