Model 121 specifications

Output

Type: Bipolar, DC current source

Current ranges: 13 fixed ranges of 100 nA, 300 nA, 1 µA, 3 µA, 10 µA, 30 µA, 100 µA, 300 µA, 1 mA, 3 mA, 10 mA, 30 mA, 100 mA, and a user-programmable range

Accuracy: 0.05% on 10 µA range, 0.5% on 100 nA and 300 nA ranges, 0.1% on all other ranges

Compliance voltage: ±11 V up to 30 mA, ±10 V up to 100 mA

AC current ripple: <0.1% on 100 nA and 300 nA ranges, <0.01% on all other ranges in properly shielded system

Current ripple frequency: Dominated by line frequency and its harmonics

Temperature coefficient: 0.03% of range/°C for the 100 nA range, 0.01% of range/°C for all other ranges

Line regulation: <0.01% change in output for 5% change in the DC input voltage

Load regulation: <0.01% change in output current over the full-scale range

Stability (24 h): 0.05% on 100 nA range, 0.01% per day on all other fixed ranges

Settling time: <300 ms for full-scale change in current; <100 ms for 10% change in current

Connector: Detachable terminal block

Maximum load: 300 kΩ

User setting

Programming

Operation: Output current settable via computer interface

Resolution: 3 significant digits

Accuracy: 0.5% for currents <300 nA, 0.25% for all other currents

Maximum current: 100 mA

Minimum current: 100 nA

Front panel

Display: 6-digit LED display

Display units: mA, µA, and nA

Display update rate: 2 rdg/s

Display annunciators: mA, µA, nA, and compliance

Keypad: 4 full-travel keys

Keypad functions: Range Up, Range Down, Current Polarity, Enable/Disable

Interface
USB

Function: Emulates an RS-232 serial port

Baud rate: 57,600

Connector: B-type USB connector

Reading rate: Up to 10 rdg/s

Software support: LabVIEW™ driver

Model 121 programmable DC current source application rangeModel 121 used with a resistive device/sensor

General

Ambient temperature: 15 °C to 35 °C at rated accuracy; 5 °C to 40 °C at reduced accuracy

Power requirement: +5 VDC ±5% at 250 mA, barrel plug 5.5 mm OD × 2.1 mm ID × 9.9 mm L   121powersymbol

Size: 96 mm W × 48 mm H × 166 mm D (3.8 in × 1.9 in × 6.5 in)

Mounting: Panel mount into 91 mm W × 44 mm H (3.6 in × 1.7 in) cutout

Weight: 0.45 kg (1 lb)

Approval: CE mark, RoHS

Possible applications of the Model 121

Single 1/4 DIN panel-mount adapter

2111 Single 1/4 DIN panel-mount adapter



Dual 1/4 DIN panel-mount adapter

2112 Dual 1/4 DIN panel-mount adapter