Verification Procedures; Inputcurrentverification; Recommended Test Equipment For Performance Verification - Keithley 595 Instruction Manual

P&ORMANCE
VERIFICATION
Table 6-1. Recommended Test Equipment for Performance Verification
Desaiption 1 Specifications 1 Manufachxrer and Model
I I
DC Calibrator
5X Digit DMM
Teraohmmeter
0.19y 1.9v, *0.002%
iO.Ol5% DC Accuracy
lOOMQ, *0.035%
Resistor
lOGi2,;0,-2%
Decade Resistor lO&lOM~, iO.O3%
Characterized Capacitors BrtF, 1.8nF, 18OpF
Shielded Test Box
BNC Cable
BNC to Banana Plug Adapter
'l'he verification limits in this section do not include
test equipment tolerance.
NOTE
CAUTION
The maximum voltage between the INPUT and
-GUARD terminals is 30V. Instrument damage
may occur if this value is exceeded.
A shielded test fixture will be necessary for the current
verification procedure. Construction of this shield is il-
lustrated in Figure 6-l.
6.5 VERIFICATION PROCEDURES
The following paragraphs contain procedures for verifying
instrument accuracy of the current and capacitance func-
tions including QkProcedures to verify the input current
and internal voltage source accuracy are also included.~
These procedures are intended for use only by qualified
personnel using accurate and reliable test equipment. Jf the
instrument is out of specification, refer to Section 8 for
calibration procedures, unless the unit is still under
warranty.
WARNING
The
maximum common mode voltage (voltage
between GUARD
[input
low1 and chassis ground)
is 30V. Exceeding this value may create a shock
hazard. Some of the procedures in this section
may expose you to dangerous voltages. Use
standard safety precautions when such
dangerous voltages are encountered.
Fluke; 343A
Keithley; 197
Guildline; 9520
Keithley; R-2894OOM
Keithley; R-289-1G
Keithley; R-319~1OG
ESI; DB-62
Keithley; 5955
See Figure 6-l.
Keithley; 4801 (supplied with 595)
Pomona; I269
65.1 Input Current Verification
Perform input current verification as follows:
NOTE
The following procedure must be performed at an
ambient~ temperature of U"C, +l"C.
1. Disconnetimall cables from the Model 595 input.
2. Place the input cap supplied with the inskument on the
METER INPUT BNC connector.
3. Select the CURRENT fundion and the 20pA range. Then
enable ZERO CHECK and perform zero CORRect.
4. Using Program FIIXER, select Filter 3.
5. Disable ZERO CHECK and allow the reading to stabiilize~
(typically one minute).
6. Verify that the display reads 0.000 26 kotints.
6-2