Model 2004 - 4 3/4 Digit DC Voltmeter with BCD Output

4 3/4 DIGIT DC VOLTMETER WITH BCD OUTPUT
MODEL 2004 - OPTION AVG/RMS

NEMA-SIZE Case

Connections Diagram

STANDARD FEATURES
Parallel BCD output
±39,999-count display span
±400 mV to ±400 V dc ranges
±10 ppm/°C span tempco (4 V range)
3-wire ratio input
120 dB CMR, 75 dB NMR
Bright, 0.56 in (14.2 mm) LED display
Automatic zero and polarity
115/230 V ac power
1/8 DIN case

OPTIONS
±49,999-count display span
±59,999-count display span
±69,999-count display span
High-impedance 3-wire ratio input
Isolated, stored, three-state parallel BCD
IEEE-488 (GPIB) interface
Digital setpoint controller
Digital peak or valley hold
5 V dc power
Screw-terminal barrier strip
NEMA-4 splash-proof lens cover
NEMA-size case

In its base configuration, Model 2004 is a 4 3/4 digit DC voltmeter which provides exceptionally high resolution, accuracy, and temperature stability. The standard display range is ±39,999 counts. Extended-range options are avail-able to ±49,999, ±59,999 or ±69,999 counts. Accuracy is 99.99% of reading. Span tempco is ±10 to ±20 ppm of reading/°C, made possible by precision wirewound resistors. The 2004 also features exceptional noise rejection. Its conversion circuit uses a crystal oscillator, which is tuned for either 50 or 60 Hz rejection.

BCD OUTPUT STANDARD
Unbuffered, non-isolated parallel BCD output is a standard feature of the 2004 and is implemented on the main circuit board. It is good for about 1 ft and can be used to interface the 2004 to a Model 872A comparator or a Model 820A printer. Additional data and control outputs can be provided by an optional upper-board.

OPTIONS
The meter main assembly can be electrically configured for four input ranges, four display spans, three round-off modes for display stability, and high-impedance 3-wire ratio input. Upper-board options include four BCD output boards, an IEEE-488 (GPIB) communications interface, and a single-setpoint controller. Mechanical options for the standard 1/8 DIN case include a screw-terminal barrier strip for signal and power and a splash-proof lens cover which meets NEMA-4 requirements. A NEMA-size case is optional.

SPECIFICATIONS

ANAOLG INPUT

Standard Range	±399.99 mV	±3.9999 V	±39.999 V	±399.99 V
Resolution	10 µV	100 µV	1 mV	10 mV
Maximum Input	100 Vp	100 Vp	250 Vp	250 Vp
Input Resistance	1 Gohm	1 Gohm	1.1 Mohm	1.0 Mohm
Bias Current	2 nA	2 nA	200 pA	20 pA
Span tempco/°C	±15 ppm	±10 ppm	±20 ppm	±20 ppm

Configuration: Bipolar, single-ended
Zero: Automatic
Span adjustment: ±1.2%

NOISE REJECTION
NMR: 70 dB, 50/60 Hz
CMR: 120 dB, DC to 60 Hz
CMV: 1500 Vp per HV test, 354 Vp per IEC spacing

ACCURACY AT 25°C
Maximum error: ±0.005% of reading ±2 counts ±10 µV
Span tempco: ±10 to ±20 ppm/°C
Step Response: 1 s
Warmup to rated accuracy: 1 hour

ANALOG-TO-DIGITAL CONVERSION
Technique: Dual-slope, average-value
Polarity: Automatic
Signal integration period: 33 ms at 60 Hz, 40 ms at 50 Hz
Read rate: 3.3/s at 60 Hz, 2.8/s at 50 Hz

3-WIRE RATIO REFERENCE

Analog input range	±400 mV	±4, ±40, ±400 V
Refernce Voltage	+0.1 to +0.4 V	+1.0 to +4.0 V
Load on reference, std	260 ohm	2.6 kohm
Load on reference, opt	1 Gohm	1 Gohm
Accuracy	99.95%	99.95%

DISPLAY
Type: 7-segment, red LED
Height: 0.56 in (14.2 mm)
Symbols: 8.8.8.8.8
Decimal points: Four positions programmable internally or at connector
Overrange indication: Display flashes

DIGITAL SIGNALS
Output signals: TTL-compatible
Input signals: TTL or 5 V CMOS compatible

POWER
AC voltages: 115 V ac ±10% at 60 Hz; 230 V ac ±10% at 50 Hz
DC voltage: 5 V dc ±5%
Power consumption: 4.5 W (nominal)

ENVIRONMENTAL
Operating temperature: 0 to 50°C
Storage temperature: 40 to 75°C
Relative humidity: 95% at 40°C (non-condensing)

MECHANICAL
Dimensions: Newport DIN1A (1/16 DIN) case standard, Newport NEMA-size case optional (see Mechanical section for drawings)
Weight: 17 oz (480 g)
Case material: 94V-0 UL-rated polycarbonate