Environmental Conditions; Warm-Up Period; Recommended Calibration Equipment - Keithley 595 Instruction Manual

Table 8-3. Recommended Calibration Equipment
DdptiOIl
1 Specifications
1 Manufachwer and Model
DC Caliiator
5'12 Digit DMM
Teraohmmeter
ReSiStor
Resistor
Decade Resistor
Characterized Capacitors
Shielded Testy Box
BNC Cable
BNC to Banana Plug
Adapter
Banana Plug to BNC
Adapter
0.19y 1.9y *0.002%
*O.OE% DC Accuracy
lOOMa, *0.035%
lOGi-2, rkO.O7%
lOOMa, kl%
lOGO, +0, -2%
1061-1OM62, * .03%
Bfi 1.8nE l80pF
Fluke; 343A
Keithley; 197
Guildline; 9520
Keithley; R-289~IOOM
Keithley; R-319~lOG
ESI; DB-62
Keithley; 5955
See Figure 8-l
Keithley; 4301
~~~~;sd;;h 595)
,
Pomona; 1296
8.5.2 Environmental Conditions
Calibration should be peiformed under laboratory condi-
tions having an ambient temperature of 23OC &PC and a
relative humidity of less than 70%.
8.5.3 Warm-Up Period
Tim on the instrument power and allow it to warm up for
at least two hours before beginning the calibration pro-
cedure. (Note: Wait at least eight hours before attempting
input current caliiration.) If the instrument has been sub-~
jetted to extremes of temperature or humidity, allow at least
one additional hour for the instrument to stabilize before
beginning the calibration procedure. Typically, it takes one
additional hour to stabilize a unit that is 1O'C @OF) out-
side the specified temperatore 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 bias current to settle to less
than 1OfA and eight hours to less than 5fA. It is
preferable in sensitive applications to leave the unit
on continuously.
8.5.4 Calibration Jumper
A jumper, located on the mother board, allows the techni-
cian to disable or enable front panel and IEEE-488 bus
d&ration. When the jumper is in the disable position, per-
manent storage of caliiration constants will not take place.
However, temporary calibration values may be entered and
used even if permanent calibration storage is disabled.
Note, however, that any call&ration parameters will be lost
once the power is turned off, unless th&y are permanently
stqecj in nonvolatile memory (NVRAM).
The calibration jumper location is located on the mother
board near the AC line receptacle (see Figure S-2). The
disable/enable positions are also shown in Figure 8-2. Note
that the jumper is in the disable position as shipped from
the factory.
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