英国稳科Wayne Kerr WK1868A高阻表Megohmmeters
 High Output Power to 80Watts
 Measurement Range: 10kΩ to 1PΩ
 Basic Accuracy: ± 2% to 1TΩ
 Programmable Test Voltage: 10V to 1kV (1868A), 50V to 5kV (1868D)
 Selectable Charge Current: to 80mA (1868A), to 18mA (1868D)
 Leakage Current Measurement Down to 1pA (± 2% Basic Accuracy)
 Programmable Charge, Delay and Discharge Times
 Contact Check Function
 5 Programmable Limit Sets
 Internal Storage of 4 Tests (20 Steps each) Plus Additional Storage with Optional PCMCIA Memory Card
 Standard RS232, IEEE and Remote I/O Interfaces
 Graphic LCD with Text, Bar Graph and X-Y Graph Displays
 Current or Resistance Display Mode
 4 Ranges Plus Automatic Ranging
 Automatic Zeroing
 Floating Power Supply (1868A) for Measurements on Grounded Devices

Resistance Range 10kΩ - 1PΩ (dependent on test voltage) 4 Ranges or Auto Range:
Range 1: 1pA to 10nA, Range 2: 2nA to 100nA,
Range 3: 20nA to 10uA, Range 4: 2uA to 1mA
Resistance Accuracy     For Rx <20G (Vx): 卤(2% of reading +5cnt) ,
For Rx >20G (Vx): 卤(Vx/1pA) in ohms.
Max reading: Vx/0.1pA
Rx = Measured resistance in ohms, Vx = Programmed voltage in volts
Voltage Range     10 to 1000V DC in 1V steps, 1868A
50 to 5000V DC in 1V steps, 1868D
Voltage Accuracy     2% of setting, 卤1V in uncalibrated mode
Source Resistance     100惟, 1kV (1868A); 3.3k惟, 5kV (1868D)
Charge Current     2/25/80mA (1868A); 2/10/18mA (1868D)
Discharge Resistance     100k惟
Current Measure     1pA to 1mA
Current Accuracy     卤[2% of reading +5cnts +1pA]
Input Impedance     For Ix > 10nA: 10k惟 ; For Ix < 10nA: 1M惟 ,Ix = Programmed current in amperes
Measure Limits     5 Programmable Limit Sets
Measurement Result     Resistance or Current
Measurement Mode     Continuous or Triggered
Averaging     1-100 measurements
Test Speed     Trigger Mode: 40msec, Continuous Mode: 90-4000msec,
(Depending on # to Average)
Programmed Time Charge: 0 - 9999msec
(Charge R: 200惟)
Measurement Delay: 0 - 9999msec
Discharge: 0 - 100sec or Auto mode     Auto: 0.1(Cx) as Vx goes to 1% Vt
Cx = Measured capacitance (渭F)
Vx = Programmed voltage (V)
Zero/Offset     Automatic Zeroing of All Ranges or Individual Zeroing of 4 Ranges
Display  LCD graphic display
3.5 digit resolution
Line Graph: X-Y: I or R versus Time     Bar Graph: 8 ranges/2 decades/graph, Fixed or auto-scale
Indicators: HV, Measure, Bin, Remote
Standard Interfaces     RS232, IEEE 488, Remote I/O
Internal Storage 2 Global Setups (Save Instrument Setup and Sequence Setups)
4 User-Programmable Sequence Setups, (Up to 20 Steps each)
4 Pre-Programmed Sequence Setups
External Storage PCMCIA Interface for 2M SRAM Memory
Cards (20 Setups/20 Steps each)
Input Terminals  HV: BNC Connector
I IN: Triaxial Connector
GUARD: Sheathed Banana Plug
Safety Interlock Plug
Password-protected Charge Current (For I > 2mA)
HV Break Red LED/Push Button
Dimensions     (w x h x d):12.5 x 4.5 x 15.5 inches (312.5 x 112.5 x 387.5 mm)
Weight 28 lbs (12.7kg) net，41 lbs (18.6kg) ship
Environmental     Operating: 10掳C to +40掳C, 80% RH
Power 110V - 240V，50 or 60Hz，400W Max (1.8A at 220V AC, 3.2A at 125V AC)