GENERAL DESCRIPTION
The NEW Krohn-Hite Model 523 Precision DC
Source is a highly stable and repeatable dc voltage
source and dc current
source providing N.I.S.T. traceable voltages and currents for use in production, calibration labs, QA and QC departments, design labs, or any place
where an accurate
voltage and current source is needed.
Using Krohn-Hites state-of-the-art
reference, the 523 provides accurate and stable voltages from
±10nVdc to
±110.99999Vdc to within ±4ppm for 90 days (±8ppm for 1 year), and precise
currents
from ±10nA to ±110.99999mA to within ±8ppm for 90 days (±16ppm for 1
year). It is an extremely
quiet source with <7”Vrms of noise measured over a
10Hz to 100kHz bandwidth (<2”Vrms 0.1Hz
to 10Hz).
The 523 features a user friendly
7œ digit display and a membrane keyboard entry of all settings.
Output
settings can be modified using a plus/minus delta function, multiply/divide
function and
curser control keys that allow placing a curser on any digit to
increment or decrement its value.
Output 2-wire, 4-wire and chassis grounding
are accomplished with one keystroke or over the
GPIB interface bus. A crowbar
function places the output in a safe mode when desired. The 523
output can be set to 0 volts, allowing
the output sense to maintain a true 4-wire low impedance
zero output. It is
also quickly forced to zero before a range change to prevent any "surprise
voltages" from appearing.
An AUTO ZERO OFFSET CALIBRATION (AZOC)
returns any thermally generated offsets to within
specified limits and is
accessible via the front panel or over the GPIB interface bus. The unit is
designed for a "Covers On Calibration using the
KH523CAL Test and
Calibration Software
Program (Field
Calibration License required). With the
KH523CAL program and either an HP3458
or Fluke 8508A Digital Voltmeter, unattended
calibrations can be made in approximately 15
minutes.
The 523
provides for the storage of up to 31 output settings that can be recalled at
any time.
Internal operating temperature, serial number, last calibration date
and firmware version can all be
called to the display for quick access when
needed. Error messages are displayed when incorrect
or out-of-range entries
are made.
APPLICATIONS
Krohn-Hite's
NEW Model 523 is well suited for many applications where an extremely accurate
and stable dc voltage or dc current is needed. At a cost much less than most
sources in its class,
the 523 can be a valuable asset to any company's
production line, calibration lab, QA and QC
department and design lab.
OUTPUT SPECIFICATIONS
The following
specifications are with a constant
internal operating temperature equal to 40șC ±1șC. The HP3458A NPLC is set for 100 and AUTO CAL cycle (ACAL)
run. The Model 523s calibration is normally done at a room temperature of 23șC
±1șC. The
internal Cal Temp is
saved at the time of calibration and can be displayed with the present internal
temperature using the [TEMP] key.
The 90 day and 1 year
specifications are within 24 hours of a zero CQL (AZOC) cycle, and a constant internal operating temperature equal to
40șC ±1șC. The zero CAL (AZOC) cycle takes out the effect of internal
DC offset drift.
(Specifications apply at
an internal temperature of 40șC ±1șC, <70% relative humidity.)
Settling Time:
<10ms.
Line
Regulation: <±0.1ppm
change for a 10% change from normal line voltage,
typically no measurable
change.
Load Regulation 4-Wire operation: <±0.1ppm change from no load to 100mA full
load, typically no measurable change.
Measurements must be made at sense lead connection
point to the load.
Compliance Voltage Effect On Current Output:
<10nA change for a 100V
change in
compliance voltage for output currents <11.11112mA, equivalent to >10
Gig-ohm output
impedance; <100nA change for a 100V change in compliance voltage
for output currents
ł11.11112mA,
equivalent to >1 Gig-ohm output impedance.
Compliance Voltage Limit: Settable
in 1V steps from 1V to 110V. Compliance limits
approximately 15% +0.25V above
the setting.
Warm-Up Time from a Cold Start: 1 Hour to
within 5ppm of final value. 4 Hours to rated
accuracy and final value.
Maximum Output Current: ±110mA.
Output protected from damage with a current
limiter. Output may be shorted to
ground indefinitely.
Calibration: The Model
523 is specified with a 1-year calibration cycle. An AUTO ZERO OFFSET
CALIBRATION (AZOC) is provided that returns any thermally generated offset to
within specified
limits, and can be accessed via front panel controls or over
the GPIB interface bus. The Model 523 is designed for a Covers On calibration using the
KH523CAL Test and Calibration
Software Program (license required). The KH523CAL software, together with
an HP3458A or Fluke 8508A Digital Voltmeter,
allows virtually unattended calibration to
be performed in approximately 15 minutes. The calibration
date and internal
temperature is stored in memory and can be called to the display or over the GPIB interface bus.
Calibration Temperature Limits (Covers-On Calibration):
Internal temperature (T Cal),
40șC ±1șC; Ambient temperature
(T Amb), 0șC to
30șC.
Protection: Voltage mode, short-circuit
and over-load protected. Current mode, open circuit
protected.
Indication by display message. Automatic
recovery.
GPIB
PROGRAMMING
Switching Time: Typically 300ms.
Subsets:
SH1, AH1, T6, SR1, RL1, PP1, DC1, DC1, DT1, CO, E1.
Line Termination:
The GPIB OEI signal is always sent with the last character on a line.
Talker Function:
Allows interrogation of the Model 523 by a controller.
TERMINALS
Output Terminals are
mounted on both the front and rear panels. Only one set of terminals may
be
used at a time.
Both terminal
sets are configured for remote sensing of the output as
follows:
High Output and High Sense
Low Output and Low Sense
Case
Ground.
GENERAL
Display:
LCD, 7.5 digits. Displays output settings and other pertinent information.
Isolation:
Power transformer-to-analog
output, control logic-to-analog
output, optically isolated.
SAFETY
The Model 523 is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement, control and
laboratory use: IEC61010-1, EN61010-1
ELECTROMAGNETIC COMPATIBILITY
Emissions and Immunity: EN61326-1, EMC, 61000-4-2; ESD, 61000-4-3; Radiated Immunity, 61000-4-4; EFT, 61000-4-5; Surge, 61000-4-6; Conducted Immunity, 61000-4-8; Magnetic Immunity, 61000-4-11; Voltage Interuption EN61010-1.
CE Compliant for Class B Equipment.
MECHANICAL
Power Requirements: Selectable
105-130 or 210-260 volts ac, single phase, 50Hz to 60Hz,
60 watts
Dimensions and Weights:
3.5 (9cm) high, 14" (36cm) wide, 12.5 (32.13cm) deep;
12 lbs (5.4kg) net, 14
lbs (6.3kg) shipping.
Operating Temperature Range: 0șC to
50șC.
OPTIONS
PCR100: 100 Ohm Precision Current Resistor
RK-314:
Rack Mount Kit permits the installation of the Model 523 into a 19 rack
spacing.
KH523CAL:
Calibration and Test License - License to unlock the 523 for calibration with
KH523CAL Calibration Software.
CAB005:
Cable, 2 conductor shielded balanced line.
CAB018:
Cable: multi-stacking double banana plug.
CAB023:
The CAB023 is a low thermal EMF retractable sheath banana plug
patch cord set. These low thermal cables minimize thermal errors so
accurate low voltage measurements can be made. Each set includes 2 test
leads (one black and one red).
CAB024:
The CAB024 is a low thermal EMF spade lug patch cord set for low
voltage measurements. These low thermal cables minimize thermal errors so
accurate low voltage measurements can be made. Each set includes 2 test
leads (one black and one red).
ACCESSORIES
3 terminal line cord.
Operating manual.
Specifications are subject to change without notice.
Copyright ©
November 15, 2006
Krohn-Hite Corporation. All rights reserved.
15 Jonathan Drive, Unit 4, Brockton, MA 02301-5566 U.S.A.
Tel: (508) 580-1660; Fax: (508) 583-8989; info@krohn-hite.com
