Ohms Measurement Accuracy; 2Kω-20Mω Range Accuracy - Keithley 6514 Instruction Manual

Ohms measurement accuracy

Follow the steps below to verify that Model 6514 ohms function measurement accuracy is
within specified limits. This procedure involves applying accurate resistances from a resistance
calibrator or standard and then verifying that Model 6514 resistance measurements are within
required limits.
WARNING
2kΩ-20MΩ range accuracy
1.
Figure 18-4
Connections for
ohms verification
(2k Ω -20M Ω
ranges)
Input
INPUT 250V PK
INPUT
OFF ON
V, GUARD
(PROGRAMMABLE)
2.
3.
4.
With the ohms function selected, the Model 6514 can output an open-circuit
voltage up to 250V. Place the unit in zero check when leads are not con-
nected.
Connect the resistance calibrator to Model 6514 INPUT jack, as shown in Figure 18-4.
Low-noise Coax BNC Cable
Triax-to-BNC Adapter
MADE IN
!
U.S.A.
500V
PEAK
IEEE-488
PREAMP OUT 2V ANALOG COMMON CHASSIS (CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
250V PK OUTPUT
DIGITAL I/O TRIGGER LINK RS232
LINE RATING
50, 60Hz
PREAMP !
60 VA MAX
PREAMP
OUT
10K FUSE LINE
2V ANALOG
GUARD 630mA T 100 VAC
OUTPUT
(FOLLOWS
(SB) 120 VAC
INPUT)
COM
315mAT 220 VAC
(INTERNAL)
(SB) 240 VAC
Model 6514 Electrometer
Select Model 6514 ohms function by pressing the Ω key, and set the calibrator to the
resistance function.
With zero check enabled, zero correct the instrument, then disable zero check.
Output 0Ω from the calibrator, and then press REL.
Performance Verification
Calibrator
Output
BNC-to-dual
Banana Plug
Adapter (Connect
Cable Shield to
Output LO)
Resistance Calibrator
18-15