Humidity Verification; Table; Limits For Humidity Verification - Keithley 6517 Service Manual

Performance Verification
Type K
Thermocouple Simulator/Calibrator
Figure 1-10
Connections for temperature verification
1.12 Humidity verification
Humidity measurement accuracy is checked by applying an
accurate 0-1V DC voltage to the Model 6517A and verifying
that the humidity readings are within specified limits.
Proceed as follows:
1. With the power off, connect the DC calibrator to the
Model 6517A HUMIDITY connector, as shown in Fig-
ure 1-11. Use short lengths of solid #22AWG copper
wire and alligator clips to make the connections, and be
sure to observe proper polarity (calibrator HI to HU-
MIDITY +V and calibrator LO to HUMIDITY -V).
2. Turn on the power to the Model 6517A and the calibra-
tor, and allow a one-hour warm-up period before mak-
ing measurements.
3. Select the Model 6517A humidity display with DIS-
PLAY PREV key.
4. Set the DC calibrator output to +0.2500V.
CAUTION
Do not exceed +2V input to the
HUMIDITY jack, and be sure to
observe proper polarity. Failure to do so
may result in damage to the unit.
1-16
EXT Temp
Jack
Type K
Thermocouple Wire
WARNING: WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY. NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
1010V
PEAK
LO
PREAMP OUT COMMON 2V ANALOG
! V SOURCE
250 PEAK OUTPUT
INPUT
750V
250V PEAK
PEAK
TEMP HUMIDITY
EXT TRIG MTR COMP
TYPE K
IN OUT
RS232
DIGITAL
I/O
OPTION SLOT
!
INTERLOCK
CAUTION: CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING. FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
Model 6517 Electrometer
5. Allow the reading to settle, then verify that the Model
6517A humidity reading is within the limits summa-
rized in Table 1-12.
6. Repeat steps 4 and 5 for each of the voltage/humidity
reading combinations summarized in Table 1-12.

Table 1-12

Limits for humidity verification
Applied Humidity reading limits
voltage
0.0000V
0.2500V
0.5000V
0.7500V
1.0000V
HI
SELECTED MADE
IN
LINE VOLTAGE
U.S.A.
90-110V 180-220V
105-125V 210-250V
LINE RATING LINE FUSE
50-60HZ SLOWBLOW
50VA MAX
1/2A 90-125V
AC ONLY 1/4A 180-250V
IEEE-488
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
TRIG LINK
(1 year, 18° to 28°C)
0% to 1%
24% to 26%
49% to 51%
74% to 76%
99% to 101%