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MODEL 616
6- 4 .
ADJUSTMENT AND CALIBRATION.
should be used whenever it is necessary to calibrate
the instrument to ensure that it meets published spe
c i f i ca t ions .
Calibration may be accomplished every
12 months to ensure accuracy over long - t erm use or
more frequently if desired.
a .
Test Equipment.
in Table 6 -6 should be used to ensure proper _result s .
Other equipment may be substituted i f specificat ions
meet or exceed those given.
h.
Environment.
The calibration should be per form
ed in a controlled environment .
tion is performed at approximately 2 5 ° C temperature
50%
and less than
relative humidi t y ,
temperature range for calibration is 2 3 ° C to 2 7 ° C .
1 .
Set the Line Switch to 117 or 234V depending
on the line power availabl e .
2 .
Fuse Check:
Verify that the appropriate line
fuse is installed.
117.\':
3/16 ampere, 3AG, SLo-BLO (Keithley FU-29)
1/10 ampere, 3AG, SLO - BLO (Keithley FU - 40)
234V:
3 .
Connect the power cord to a variable trans
former which has been set to l17V
2V depending on the line power available.
4 .
Connect the short ing link (on the r�ar panel)
between LO and GROUND .
t y , make certain that the chassis is connected to
earth ground by way of the third conductor on the
line cord or by way of a separate clip lead from
GROUND t o earth ground.
5 .
Turn the inst rument power on and allow the
instrument to stabilize at ambient t emperature for
at least 1/2 hour.
temperature coefficients can be utilized as neces
sary.
Item
F
Voltmeter. 3 - 1 / 2 d i g i t s ,
l lJ V resolution
G
Oscilloscope (Used for
power supply check)
H
Voltage Source (DC) ±SmV
I
Voltage Source (DC ) , 10mV
to lOOV in decade steps
(For lOmV range use 1 0 : 1 divider)
J
Resistance Source, lo
1175
This procedure
The test equipment recommended
The factory calibra
Recommended
±
IV or 234V
For maximum operating safe
Record the temperature so that
Required Test Equipment for Calibration.
S
h
d .
Power Supply Check.
that the power supply voltages are within nominal
tolerences.
1 .
Measure the supply voltage at the test points
given in Table
2 .
Verify the reading for each voltage.
e .
all Measuremen ts . )
1 .
Front Panel Zero.
a) .
b ) .
c ) .
meter ( F ) .
d ) .
± . OlOmV d e .
e) .
I f the front panel ZERO control does not pro
vide enough adjus tment capability,
nal potentiometer R123 should be adjusted.
(Located on small pc board inside shielded
input comp artment . )
±
A - D Input Zero.
2 .
a ) .
b ) .
c ) .
meter
(F) .
d ) .
± l . OmV d e .
e ) .
as necessary .
TABLE 6 - 6 .
± O . 2 %
accuracy
ImV/divis ion ac coupled
±l% accuracy
± 0 . 03%
accuracy
± 0 . 02 %
accuracy
This procedure verifies
No adjustments are required .
6-7
using Voltmeter (F) .
(Select NORMAL mode for
Place ZERO CHECK to on.
Select lOmV SENSITIVITY.
Monitor the Xl output (Jl18) using Volt
Reading on Voltmeter ( F ) should be
Adj ust front panel ZERO (Rll9) a s necessary ,
NOTE
Place ZERO CHECK t o on.
lOmV
Select
SENSITIVITY .
Monitor the IV output
(Jll7) using Volt
Reading on Voltmeter
(F)
Adjust potentiometer R3l1 (A-D INPUT ZERO)
Mfr . and Model
160
Keithley Model
Tektronix, Model 56lA
260
Keithley Model
Fluke , Model 34lA
GR 1455B H (divider for 10mV)
General Radio, Model 1433
MAINTENANCE
, 00 0
the inter
00 . 0
should be
35
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