2003S TIME-ELECTRONICS | Alldatasheet
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Technical content
@ 0.02% Accuracy | (j= A . = | @ Battery/Mains Operation P[0GNoltage Cay ee =| @ 20 mA Output | é . eg woe 4 @ 10 PPM Per Hr Stability | /) 30 || @ Portable 22 x 16 x 19cm oo ‘| The 2008S is a solid state battery powered instrument | ook | suitable for applications requiring a precision voltage | . z rie | source of low internal resistance. Its small size, robust le = oe : construction and independence of mains power make it i | - easily portable and convenient for laboratory, field and q t = industrial use. Five ranges to 10 V are provided with a sil extension to 1000 V using an external optional unit. 4 ec—"— ” Applications include calibration, linearity and gains —_ eels stability measurements, etc. on DC amplifiers, digital and electronic voltmeters, data loggers and chart recorders. The 10 ppm per hr stability and low noise levels are of particular interest when an extremely stable backing off voltage is required. 2003N Precision Voltage Calibrator and Potentiometer @ 20035 Plus . @ Micro-Volt Null Balance for _ Potentiometric Measurement 1 The 2003N includes all the features of the 2003S with the iE SEL 2003N_ 002% GRE § addition of a microvolt null balance display. This enables it S ater ee | to be used for potentiometric voltage measurement in 21 Me addition to its basic function as a calibrator. The null zero 0. 2-0°0 3 I a | and sensitivity are adjustable via front panel controls— # _~ » | maximum sensitivity enables null balance to within , a ® L ) 1 microvolt. = asa Applications are essentially those of conventional 4 Hie ae | | potentiometers with the following significant advantages: 3 | ‘ 1. No standardisation is required. a ‘= 2, 20 mA output current. Be __ 3. Electronic null with microvolt sensitivity. OO.
DESCRIPTION
The Calibrator employs a precision zener diode as a basic reference source. This provides the input to an F.E.T. chopper amplifier system which operates in a feedback stabilised mode. The gain value is determined by a set of precision metal film resistors which are selected by the 5-decade thumbwheel switch. The output voltage is variable from 0 to 9.9999 V in 5 ranges. This can be extended to 1000 V by means of an external mains-powered unit which is available as an extra. The Calibrator’s output resistance is typically 50 milliohms on the top 3 ranges and the maximum output current that can be drawn on these ranges is automatically limited to 35 mA—this is to prevent damage to the circuitry in the event of accidental short circuit, etc. The lower ranges have an output resistance of 1 ohm and will supply current up to the short circuit value. To ensure complete reliability the Calibrator range switch employs two contacts in parallel for each position—even if a contact fails the calibrator still functions correctly. The 2003N version incorporates a high performance null amplifier system which allows potentiometric measurements toa resolution of 1 microvolt. Null is obtained by adjusting the thumbwheel digits until the display meter indicates zero. The meter is scaled 20-0-20 and by suitable adjustment of the sensitivity control can display directly in mV or 1 V. The 100 V and 1kV Output Units are mains-powered units which extend the output capability of the 2003. They are connected to the Calibrator output terminals and accurately multiply the Calibrator output voltage.
SPECIFICATION Output Polarity 1a Positive or negative switch selected. A centre ‘off bats ‘Lins position is provided. 0- in § ranges. | 0-9.9999 V in 100 wV steps Output Noise Level | 10 V, 1 V, 100 mV ranges: Less than 10 ppm of setting | 0-999.99 mV in 10 ,.V steps. £2 uV (0-10 Hz) 0-99.999 mV in 1 4V steps. a é | 0-999.99 4 V om 0.01 pV steps. Reference Source Precision zener diode selected after a special ageing Accuracy 7 5 process for a temperature co-efficient better than 10V & 1 Vranges: qocswetreaee” 5 ppm/°C and stability better than 10 ppm per month, 100 mV, 10 mV & 1 mV ranges hon cumulative, +0.05% of setting. Power Supply ! +£0.005% of range. Time Electronics power unit type PU2 which is housed +1 pV. in the rear of the 2003. The PU2 will power the 2003 | Output Resist direct from the mains or an internal rechargeable i WoL IG0. ie _— battery. The battery is automatically charged when ov, WOeennEe jan Ooh: mains power is connected, Alternatively an optional eet ae me in battery unit taking ten 1.5 V U2-size cells (60 x 33mm | m mv Fanges: ohm. dia.) may be fitted in place of the PU2. Access to the | Maximum Output Current battery compartment is from the instrument rear.
10 V, 1 V& 100 mV ranges: 30 mA Batte:
" ry Level Indicator mets nd manawe: Ue shin curcalt Nalnasiithoagh A front panel display provides a continuous indication k ee it shoul e noted that toa of greater than 1 Kohm of the battery state, a minimum level indicating the est will give greater than 0.1% error. batteries should be changed or recharged Moximam Overload " : Null Balance (2003N only) e instrument can withstand continuous short circuit The Null display is on a front panel meter, zero and on the output for all ranges. The 10 V, 1 Vand 100 mV sensitivity controls are provided ranges have an automatic output current limit set at Max. Sensitivity: +20 zV fs.d. (2 mV/div. ) soma: Min, Sensitivity: +200 mV fs.d Output Voltage Stability Meter Scale: 20-0-20 (20 divisions) Less than 30 ppm/°C (0°C to + 80°C). Input Resistance: 10 Mohms increasing to greater than Less than 8 ppm/V variation in supply voltage. 100 Mohms at null balance. Less than 78 ppm/year. Dimensions: 220 x 160 x 190 mm. Less than 10 pprv/hr at constant temperature. Weight: 3.3 kg. RA Rack Mount Panels iajaeesiaminiealaiaions Pre-punched matt black panels 4 u high (172 mm) are 1 kV Output Unit available for mounting either one or two 2003-size A separate mains-powered unit which enables the units in 19 in. systems. output capability to be increased. It is corinected to Carry Case the 2003's output, extending the range to 1000 V. Houses the 2003 for field use, etc. A leather shoulder Transfer Accuracy: 0.05%. strap and leads compartment are provided. Operation Maximum Output Current: 3 mA. in the case is possible. Dimensions: 160 x 216 x 198 mm. Calibration Certificates by an Traceable [+ eS See 1013 data sheet for full specification. to National jo #eScawinee woe : 100 V Output Unit Standards Jj¢ Sur GF REPS Res . A separate mains-powered unit which enables the can be el Ce = output capability to be extended to 100 V. It is supplied. 7 ie qs 7 connected to the 2003 output and multiplies the 10 V : oo nee ;
ORDERING INFORMATION
Description Order Code Description . Order Code 100 V Output Unit... apemensenmmecesy 1014 Note: Standard mains input is 200-250 V, 50/60 Hz. Botany Industrial Estate Tonbridge - Kent TN9 1RH- England Telephone: (0732) 355993 Telex: 95481