Keithley 486 User Manual

SECTION 7
Maintenance
Table 7-8. V-Source Checks (Model 487 Only)
step Item/Component
Required Condition Remarks
1
V-Source Contiols
Standby operation OO.oOOV setting (5OV range)
lnitlal conditions
2 Reference point
Connect DMM LO on scope LO to V-SOURCE
Au voltages referenced to V-Source
OUTPUTLO
common.
3
UlcQ, pin 1
+15v, rt5% +15vB supply
4 um, pin 3
-15v, 6%
-15VB supply
i
u102, pin 1
+5v, f5%
+5vB supply
VRlCO, anode
+8ooV, k15% +SOoVB supply
7
V-Source Controls Set to lO.CMW (5OV range) Place in OPERATE
Source +lOV on 50V range to open
output terminals
8 u151, pin 5
+1.54v
DAC output
9 UN!, pin 6
-1.54v Inverting Xl buffer output
10 UllO, pin 6
-7v High impedance amplifier output
11 QlOl, gate
+13v Power PET
12 QlO5, source -3v
Power PET
13 V-Source output +10.000V*14mV Voltage source output
14 V-Source Controls Set to OlO.OOV (5OOV range). Place in OPERATE Source +lOV on 5COV range
15 u151, pin 5
+153mv DAC output
16
U143, pin 6 -153mv Inverting Xl buffer output
17 UllO, pin 6 -7v
High impedance amplifier output
18 QlOl, gate c13v
Power FET
19 QlO5, source -3V
Power PET
20 v-source output
+lO.cnNV, f55mv
Voltage source output
21 -
Short output, set I-Limit to 2.5mA
-
22 4103, source
+0.7v Power PET
23 -
set I-Limit to 25pA
-
24 U119, pin 6 -9v
25&A I-Limit control
25 VRlO6,cathode -3v Line voltage protection
26 QlOl, gate +3v Power FET
27 QlO5, source -3v
Power PET
28 V-Source Controls Place in Standby
7-18

Keithley 486 Specifications

General

Brand	Keithley
Model	486
Category	Measuring Instruments
Language	English