Service manual

Example: Closed

Channel Resistance

Test

This example performs a Closed Channel Resistance Test to measure

Channels 00 - 47, Channels 90-92 and Channel 93 HI, LO, and GU relay

contact resistances. If the relay contact resistance for a channel is >2.0

Ω

the program prints a message indicating which channel has failed the test.

Use this list in chapter 4 when troubleshooting a failing relay.

NOTE

Since small measurement variations may occur when measuring the

protection resistors, the program returns "0.00" if the calculated resistance

is <0

Ω .

10! RE-SAVE "CLOS_TEST"

20 ASSIGN @Dmm TO 722

30 ASSIGN @Mux TO 70914

40 DISP CHR$(129)

50 DIM R(38:43),Value0(47),Value1(3,3),Result0(47),Result1(3,3),

Path$(2)[2]

60 DATA HI,LO,G

70 READ Path$(*)

80 !

90 !Measure protection resistors

100 !

110 PRINT "Measure Protection Resistors R38 - R43 "

120 PRINT TABXY(1,3)," 1. Turn mainframe power OFF"

130 PRINT TABXY(1,4)," 2. Remove E1346A Component Assembly from

mainframe"

140 PRINT TABXY(1,5)," 3. Set DMM for 4-wire ohms (OHMF) function "

150 DISP " Press Continue when ready to measure protection resistors "

160 PAUSE

170 CLEAR SCREEN

180 FOR I=38 TO 43

190 PRINT TABXY(1,4),"Connect DMM leads (4-wire) to resistor R";I

200 PRINT TABXY(1,5),"Measure resistor R";I;"value (in Ohms)"

210 INPUT " Enter resistor value (in Ohms), and press Return ",R(I)

220 NEXT I

230 CLEAR SCREEN

240 PRINT "Install Component Assembly and Test Fixture "

250 PRINT

260 PRINT " 1. Turn Mainframe AND Agilent 3458a DMM power OFF"

270 PRINT " 2. Connect GPIB Cable between mainframe and DMM"

280 PRINT " 3. Install E1346A Component Assembly into Mainframe"

290 PRINT " 4. Attach Test Fixture to Component Assembly"

Verification Tests 2-11