Keithley 2001 Repair Manual

Troubleshooting
2-19
Table 2-10
DC_STB control registers
Register Bit Pin Control Description
U801 Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
4
5
6
7
14
13
12
11
FAST
LST_PH
FREQ_EN
I3, FREQ_LOAD
I4
I5
I6
I7
1 = FAST integration on A/D converter (ADC).
1 = Normal ADC operation.
1 = Normal ADC operation.
1 = Normal ADC operation.
Set ADC conversion rate (LSB).
Set ADC conversion rate.
Set ADC conversion rate.
Set ADC conversion rate.
U800 Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
4
5
6
7
14
13
12
11
I8
I9
I10
I11
I12
I13
OHMCA
OHMCB
Set ADC conversion rate.
Set ADC conversion rate.
Set ADC conversion rate.
Set ADC conversion rate.
Set ADC conversion rate.
Set ADC conversion rate (MSB).
Select Ohms Cal on U325 (LSB).
Select Ohms Cal on U325 (MSB).
U300 Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
4
5
6
7
14
13
12
11
BUF, /BUF
VLO2, BSCOM
/REF
//1
/CAL
//2
/ZERO
FE ZERO, ONE SHOT
1 = Q306 on and Q304 off.
0 = -8VF to VLO2, 1 = -8VF to BSCOM.
0 = 7V ref to A/D Buffer (via U317).
0 = Input Buffer to A/D Buffer (Q308 and Q313
on).
0 = Cal Divider to A/D Buffer (via U319).
0 = -0.5 or 1.5 gain (via U319).
0 = Zero to A/D Buffer (via U319).
1 = Q527 and Q539 on, 0 = ONE SHOT (via U334)
for PRECHARGE (Q538 on).
U303 Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
4
5
6
7
14
13
12
11
/X1
/X5
/X50
/2VREF
/AC
/DCA
nc
nc
0 = x1 A/D Buffer; U318 (/X1) closed.
0 = x5 A/D Buffer; U318 (/X5) closed.
0 = x50 A/D Buffer; U318 (/X50) closed.
0 = 1.75V ref to A/D Buffer (via U318).
0 = ACV/A to A/D Buffer (via U320).
0 = DCA to A/D Buffer (via U320).
x
x

Keithley 2001 Specifications

General

Brand	Keithley
Model	2001
Category	Multimeter
Language	English