Ashcroft ATE-2 - Handheld Calibrator - Manual (Page 63)

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SECTION 15 n. CALIBRATE BASE UNIT CONT. Obtaining “As found” and “As Left” data procedure consists of
applying precision voltage and current signals to the proper termi-
nations and reading the values displayed on the HHC display.
Base unit recalibration is a firmware based, menu driven pro-
cedure that provides prompts on the HHC display directing the
operator to apply precision voltage and current signals to desig-
nated terminals. Recalibration is accessed via the menu system.
Calibration Function Password
HHC calibration functions are password protected. The pass-
words may be obtained by contacting the factory or downloading
the” HHC Secure” application from the web site. “HHC Secure”
will generate the HHC’s unique pass codes based on user input
of the base unit serial number. Make a note of these pass codes
The base unit serial number is needed to determine the pass-
word. To locate the serial number label remove any installed
pressure modules, hold the base unit keypad side down and
look into the module bays. The serial number is also displayed
briefly during HHC base unit power up. The label is located on the
underside of the keypad/front panel section of the base unit.
Calibration Equipment Required
In order to perform HHC base unit verification and recalibration
a precision voltage and current standard is required. To maintain
specified accuracy of the HHC base unit, the calibration standard
must exceed the base unit accuracy specification four times the
specification of the HHC base unit. The voltage and current stan-
dard is needed both for documenting calibration data as well as
the recalibration procedure,
The instrument must be capable of providing resolution and accu-
racy at least to the following levels;
• SENSOR MODULE INPUT 0 to + 1.00000 ±20uv DC (0.00002
volt) (required accuracy ±.005%)
• 10 VOLT CALIBRATION 0 to +10.000 ±625uv DC (0.000625
volt) (stated accuracy
±.025%)
• 30 VOLT CALIBRATION 0 TO 30.000 ±7.50mv DC (0.0075
volt)(stated accuracy ±.1%)
• 20 ma CALIBRATION 0 to 20.000 ± 1.5ua (0.0000015
amp) DC (stated accuracy ±.03%)
Required Equipment Calibration Module part number
312D224-01
HHC Base Unit Documenting Calibration Data
(As Found and As Left Data)
Documenting the condition of the HHC before and after it is recali-
brated (“As Found” and “As Left”) follows the same procedure. The
operator will verify and document the accuracy of the DC voltage
input, the DC current input and the Channel 1 module input.
The number of points verified when documenting calibration data
varies based on customer requirements. At minimum zero and
full scale values should be documented. Calibration data must be
manually collected and documented. The HHC does not log its
own calibration data.
Documenting Calibration Data Procedure
NOTE: The input jacks for the 10 and 30 volt inputs are the same
input jacks, the accuracy statement for 10 volts is for values
between 0 and 10 volts DC, the accuracy statement for 30 volts
DC is for values above 10 volts to 30 volts DC
VOLTAGE JACK INPUT, 0-10 volts
1. Connect the negative lead of the voltage standard to the
black ringed “COM” input jack
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