Keithley 2015, Service Manual

Page: 119 / 158

Specifications A-5
DC OPERATING CHARACTERISTICS 2
FUNCTION DIGITS READINGS/s PLCs 8
DCV (all ranges), 6 1 ⁄
2 3, 4
5 10
DCI (all ranges), and 6 1 ⁄
2 3, 7
30 1
2W Ohms (<10M range) 6 1 ⁄
2 3, 5
50 1
5 1 ⁄
2 3, 5
270 0.1
5 1 ⁄
2 5
500 0.1
5 1 ⁄
2 5
1000 0.04
4 1 ⁄
2 5
2000 0.01
DC SYSTEM SPEEDS 2, 6
RANGE CHANGE 3 : 50 / s.
FUNCTION CHANGE
3
: 45 / s.
AUTORANGE TIME
3, 10
: <30 ms.
ASCII READINGS TO RS-232 (19.2K BAUD): 55 / s.
MAX. INTERNAL TRIGGER RATE: 2000 / s.
MAX. EXTERNAL TRIGGER RATE: 400 / s.
DC GENERAL
LINEARITY OF 10VDC RANGE: ±(2ppm of r 1ppm of range).
DCV,
Ω
, TEMPERATURE, CONTINUITY, DIODE TEST INPUT PROTECTION: 1000V, all ranges.
MAXIMUM 4W
Ω
LEAD RESISTANCE: 10% of range per lead for 100
Ω
and 1k
Ω
ranges; 1k
Ω
per lead for all other ranges.
DC CURRENT INPUT PROTECTION: 3A, 250V fuse.
SHUNT RESISTOR: 0.1
Ω
for 3A, 1A and 100mA ranges. 10
Ω
for 10mA range.
CONTINUITY THRESHOLD: Adjustable 1
Ω
to 1000
Ω
.
AUTOZERO OFF ERROR: Add ±(2ppm of range error + 5µV) for <10 minutes and ±1°C change.
OVERRANGE: 120% of range except on 1000V, 3A and Diode.
SPEED AND NOISE REJECTION
RMS NOISE
RATE READINGS/S DIGITS 10V RANGE NMRR
12
CMRR
13
10 PLC 5 6
1
⁄
2
< 1.5 µV 60 dB 140 dB
1 PLC 50 6 1 ⁄
2
< 4 µV 60 dB 140 dB
0.1 PLC 500 5 1 ⁄
2
< 22 µV — 80 dB
0.01 PLC 2000 4 1 ⁄
2
< 150 µV — 80 dB
DC Notes
1. Add the following to ppm of range accuracy specification based on range:1V and 100V, 2ppm; 100mV, 15ppm; 100
Ω
, 15ppm; <1M
Ω
, 2ppm; 10mA and 1A, 2ppm;
100mA, 20ppm.
2. Speeds are for 60 Hz operation using factory default operating conditions (*RST). Autorange off, Display off, Trigger delay = 0.
3. Speeds include measurement and binary data transfer out the GPIB.
4. Auto zero off.
5. Sample count = 1024, auto zero off.
6. Auto zero off, NPLC = 0.01.
7. Ohms = 24 readings/second.
8. 1 PLC = 16.67ms @ 60Hz, 20ms @ 50Hz/400Hz. The frequency is automatically determined at power up.
9. For signal levels >500V, add 0.02ppm/V uncertainty for the portion exceeding 500V.
10. Add 120ms for ohms.
11. Must have 10% matching of lead resistance in Input HI and LO.
12. For line frequency ±0.1%.
13. For 1k
Ω
unbalance in LO lead.
14. Relative to calibration accuracy.
15. Specifications are for 4-wire ohms or 2-wire ohms with REL function.