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Model 2750 Multimeter/Switch System Specification


DC CHARACTERISTICS1

CONDITIONS: MED (1 PLC)2 or 10 PLC or MED (1 PLC) with Digital Filter of 10

Dc characteristics

TEMPERATURE19

Display in °C, °F, or K. Exclusive of probe errors.)

Thermocouples (Accuracy based on ITS-90.)

temperature table

DC SYSTEM SPEEDS15,18

RANGE CHANGES16: 50/s (42/s).
FUNCTION CHANGES16: 50/s (42/s)
AUTORANGE TIME16: <30ms
ASCII READINGS TO RS-232 (19.2k BAUD): 55/s.
MAX. INTERNAL TRIGGER RATE: 2000/s.
MAX. EXTERNAL TRIGGER RATE: 375/s.

DC MEASUREMENT SPEEDS15

Single Channel, 60Hz (50Hz) Operation

DC measurement speeds

Multiple Channels Into Memory15,18,25

7703 and 7710 Scanning DCV 230/s
7703 and 7710 Scanning with Limits or Time Stamp On 230/s
7703 and 7710 Scanning DCV alternating 2WΩ 55/s
7710 Scanning Temperature (T/C) 90/s
7700 and 7708 Scanning Temperature (T/C) 50/s

Multiple Channels Into and Out of Memory15,16,17,18,25

7703 and 7710 Scanning DCV 200/s
7703 and 7710 Scanning with Limits or Time Stamp On 200/s
7703 and 7710 Scanning DCV alternating 2WΩ 45/s
7710 Scanning Temperature (T/C) 85/s
7702 Scanning DCV 65/s
7700 and 7708 Scanning Temperature (T/C) 50/s

DC SPEED vs. NOISE REJECTION

DC speed vs noise rejection

DC MEASUREMENT CHARACTERISTICS

DC Volts

A-D LINEARITY: 1.0 ppm of reading + 2.0 ppm of range.
INPUT IMPEDANCE:
100mV-10V Ranges: Selectable >10GΩ// with <400pF or 10MΩ ±1%.
100V, 1000V Ranges: 10MΩ ± 1%.
Dry Circuit: 100kΩ ±1% // <1µF.
INPUT BIAS CURRENT: <75pA at 23°C.
COMMON MODE CURRENT: <500nApp at 50Hz or 60Hz.
AUTOZERO ERROR: Add ±(2ppm of range error +5µV) for <10 minutes and ±1°C.
INPUT PROTECTION: 1000V, all ranges, 300V with plug-in modules.

Resistance

MAX 4WΩ LEAD RESISTANCE: 80% of range per lead (Dry Ckt Mode). 5Ω per lead for 1 range, 10% of range for 10, 100 and 1k ranges; 1kΩ per lead for all other ranges.
OFFSET COMPENSATION: Selectable on 4WΩ, 1Ω, 10Ω, 100Ω, 1kΩ, and 10kΩ ranges.
CONTINUITY THRESHOLD: Adjustable 1 to 1000Ω.
INPUT PROTECTION: 1000V, all Source Inputs, 350V Sense Inputs, 300V with plug-in modules.

DC Current

SHUNT RESISTORS: 100mA-3A, 0.1Ω. 20mA, 5Ω.
INPUT PROTECTION: 3A, 250V fuse.

Thermocouples

CONVERSION: ITS-90.
REFERENCE JUNCTION: Internal, External, or Simulated (Fixed).
OPEN CIRCUIT CHECK: Selectable per channel. Open >11.4k ±200Ω.
EARTH ISOLATION: 500V peak, >10GΩ and <300pF any terminal to chassis.

DC Notes

1. 20% overrange except on 1000V and 3A.
2. Add the following to “ppm of range” uncertainty; 100mV 15ppm, 1V and 100V 2ppm, 1Ω and Dry Circuit Ω 40ppm, 10→<1MΩ 2ppm, 20mA and 1A 10ppm, 100mA 40ppm.
3. ±2% (measured with 10MΩ input resistance DMM, >10GΩ DMM on 10MΩ and 100MΩ ranges). For Dry Circuit Ω, ±25% with Input HI connected to Sense HI; with Sense HI disconnected add 30mV.
4. Relative to calibration accuracy.
5. For signal levels >500V, add 0.02ppm/V uncertainty for portion exceeding 500V.
6. Specifications are for 4-wire Ω, 1Ω 10Ω, and 100Ω with offset compensation on. 77xx plugin modules with LSYNC and offset compensation on.With offset compensation on OPEN CKT. VOLTAGE is 12.8V. For 2-wire Ω add 1.5Ω to “ppm of range” uncertainty. 1Ω range is 4-wire only.
7. Must have 10% matching of lead resistance in Input HI and LO.
8. Add the following to “ppm of reading” uncertainty when using plug in modules:

ppm reading table

9. Add 1.5V when used with plug-in modules.
10. For RATIO, DCV only. For AVERAGE, DCV and Thermocouples only. Available with plugin modules only.
11. Add 6µV to “of range” uncertainty when using Models 7701, 7703, and 7707, 3µV for Models 7706, 7709, and 7710.
12. Auto zero off.
13. For LSYNC On, line frequency ±0.1%. For LSYNC Off, use 60dB for ≥ 1PLC.
14. For 1kΩ unbalance in LO lead. AC CMRR is 70dB.
15. Speeds are for 60Hz (50Hz) operation using factory defaults operating conditions (*RST). Autorange off, Display off, Limits off, Trigger delay = 0.
16. Speeds include measurements and binary data transfer out the GPIB (reading element only).
17. Sample count = 1000 (into memory buffer), auto zero off.
18. Auto zero off, NPLC = 0.01.
19. Additional Uncertainty
ppm reading table ppm reading table
20. For lead resistance >0Ω, add the following uncertainty/Ω for measurement temperatures of:
ppm reading table

21. For 4-wire  only, offset compensation on, LSYNC on.
22. For Dry Circuit 1kΩ range, 2 readings/s max.
23. For Front Inputs, add the following to Temperature Coefficient “ppm of reading” uncertainty: 1MΩ 25ppm, 10MΩ 250ppm, 100MΩ 2500ppm. Operating environment specified for 0°C to 50°C and 50%.
24. Front panel resolution is limited to 0.1Ω.
25. Single card installed in mainframe.

AC SPECIFICATIONS1

Ac Specifications

Additional Uncertainty ±(% of reading)

Additional Uncertainity

AC MEASUREMENT CHARACTERISTICS

AC Volts

MEASUREMENT METHOD: AC-coupled, True RMS.
INPUT IMPEDANCE: 1MΩ ±2% // by <100pF.
INPUT PROTECTION: 1000Vp or 400VDC, 300Vrms with plug-in modules.

AC Current

MEASUREMENT METHOD: AC-coupled, True RMS.
SHUNT RESISTANCE: 0.1Ω.
BURDEN VOLTAGE: 1A <0.5Vrms, 3A <1.5Vrms. Add 1.5Vrms when used with plug-in modules.
INPUT PROTECTION: 3A, 250V fuse.

Frequency and Period

MEASUREMENT METHOD: Reciprocal Counting technique.
GATE TIME: SLOW 1s, MED 100ms, and FAST 10ms.

AC General

AC CMRR6 : 70dB.
VOLT HERTZ PRODUCT15: ≤8 × 107 Volt-Hz

AC MEASUREMENT SPEEDS7,8

Single Channel, 60Hz (50Hz) Operation

Ac measurement speeds

Multiple Channel Into Memory10,11

7710 SCANNING ACV: 180/s.
7710 Scanning ACV with Auto Delay On: 2s/reading.

AC SYSTEM SPEEDS7,9,11

RANGE CHANGES12: 4/s (3/s).
FUNCTION CHANGES12: 4/s (3/s).
AUTORANGE TIME: < 3s.
ASCII READINGS TO RS-232 (19.2k baud): 50/s.
MAX. INTERNAL TRIGGER RATE: 300/s.
MAX. EXTERNAL TRIGGER RATE: 250/s.

AC Notes

1. 20% overrange except on 750V and 3A.
2. Specifications are for SLOW mode and sine wave inputs >5% of range. SLOW and MED are multi-sample A/D conversions. FAST is DETector:BANDwidth 300 with nPLC = 1.0.
3. Applies to 0°–18°C and 28°–50°C.
4. Specifications are for square wave inputs only. Input signal must be >10% of ACV range. If input is <20mV on the 100mV range then the frequency must be >10Hz. For sinewave inputs, frequency must be >100Hz.
5. Applies to non-sine waves >5Hz and <500Hz. (Guaranteed by design for Crest Factors >4.3)
6. For 1kΩ unbalance in LO lead.
7. Speeds are for 60Hz (50Hz) operation using factory defaults operating conditions (*RST). Autorange off, Display off, Limits off, Trigger delay=0.
8. Includes measurement and binary data transfer out GPIB (reading element only). 9. Auto Zero off.
10. Sample count = 1000 (into memory buffer).
11. DETector:BANDwidth 300 with nPLC = 0.01.
12. Maximum useful limit with trigger delay = 175ms.
13. Typical uncertainties. Typical represents two sigma or 95% of manufactured units measure < 0.35% of reading and three sigma or 99.7% < 1.06% of reading.
14. For signal levels >2.2A, add additional 0.4% to “of reading” uncertainty. 15. 750Vac range limited to 707Vrms and 85KHz (sinewave input) or 8 × 107 Volt-Hz