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SECTION 6
PERFORMANCE VERIFICATION
6.1 INTRODUCTION
'-~
6.4 RECOMMENDED
TEST EQUIPMENT
The procedures outlined in this section may be used to
Table 6-l lists all test equipment required for verification.
verify that the instrument is operating within the limits
Alternate equipment may be used as long as the substitute
stated in the specifications at the front of this manual. Per-
equipment has specifications at least as good as those listed
formance veritkation may be performed when the instru-
in the table.
ment
is
first received to
&I&
that
no
damage
or
misad-
justment has occurred during shipment. Verification
may
also be performed whenever there is a question of ins&-
ment accuracy, or following calibration, if desired.
NOTE
If the instrument is still under warranty (less than
one year from
the
date of shipment), and its per-
formance falls outside the specified range, contact
you Keithley representative or the factory to deter-
mine the correct course of action.
6.2 ENVIRONMENTAL
CONDITIONS
Accuracy checks should be made at 18" to 28°C and at less
than 70% relative humidity. However, if the input current
is to be checked, do so at 23'C, Q'C.
6.3 INITIAL CONDITIONS
The Model 595 must be huned on and allowed to warm
up for at least two hours before beginning the verification
procedures. (N0TE Wait at least eight hours before attemp-
ting input current verification procedures.) If the instru-
ment has been subject to extremes of temperature (outside
the ranges specified in paragraph 6.2), additional time
should be allowed for internal temperatures to reach nor-
mal operating temperature. Typically, it takes one additional
hour to stabilize a unit that his 10°C (EYF) outside the
specified temperature range.
NOTE
While rated accuracy is achieved after the two hour
warm up period, input bias current may require ad-
ditional time to come to its optimum level. Allow
two hours for input bii
currents to settle to less
than lOfA and eight hours to less than 5fA. It is
preferable in sensitive applications to leave the unit
on continuously.
NOTE:
TO
AVOID
CI~NTAIIINATION.
DO
NOT
TOUCH
BODY
OF
RESISTOR.
AFTER
ASSEMBLY.
CLEAN
ENTIRE
FIXTURE
WITH
IIETHANOL.
CALIBRATOR
595
INPUT
PARTS
LIST
I.
SHIELDED
BOX.
POMONA
P/N2909.
2.
BNC
CONNECTOR;
KEITHLEY
P/N
CStt.
3.
TWO
BANANA
JACKS.
KEITHLEY
P/N
BPll.
t.
BNc
CABLE
(NOT
SHOWN),
XEITHLEY
NDDEL
tBO1.
NECESSARY
TO
CONNECT
FIXTURE
TO
595.
Figure 6-1. Test Fixture Construction.
6-l
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