Desco EMIT 500524, Operating Instructions

Page: 2 / 5

TB-6542 Page 2 of 5 Revision 10/04
50524
Limit Comparator
Calibration for models 50522 and 50528 OPERATOR
CALIBRATION CHECK RESISTOR BOX
OPERATING INSTRUCTIONS
1. The purpose of the DUAL WIRE Limit Comparator Operator Calibration Check
Resistor Box is to verify the calibration of the ZVM 50528 and the 50522 by
checking 4 operator conditions: FAIL LOW, PASS SAFE (low limit), PASS SAFE
(high limit), and FAIL HIGH.
2. There are 10 resistor settings on the resistor box, which can be set using the
rotary switch. Positions 3 through 8 have installed values. Positions 1, 2, 9, and
10 can be installed by the user for one set each of custom low and high limits.
The standard settings are as follows:
POSITION:
1.) optional low limit fail low
2.) optional low limit pass safe
------------------------------
3.) 1.91 M Ω FAIL LOW
4.) 1.91 M Ω PASS SAFE
(ZVM default settings)
5.) 10 M Ω PASS SAFE
6.) 10 M Ω FAIL HIGH
------------------------------
7.) 35 M Ω PASS SAFE
8.) 35 M Ω FAIL HIGH
9.) optional high limit pass safe
10.) optional high limit fail high
PLEASE NOTE THAT THE ZVM OPERATOR CALIBRATION CHECK RESISTOR
BOX IS USED TO CHECK ONE OPERATOR AT A TIME.
3. Ensure that the ZVM to be checked is set up as described in the operating
instructions and has power.
4. Connect the plug from the resistor box into the OPERATOR 1 remote jack.