AccuMac AM8040 User manual

Rev. 202206V1
AM8040 Precision Thermometer
User’s Guide
Please download the latest version at www.accumac.com

AM8040 Precision Thermometer User’s Guide
Rev. 202206V1 1/40
Table of Contents
Important Notice ---- Warning ......................................................................... 2
1Introduction............................................................................................... 3
1.1 Main Application .................................................................................... 3
1.2 Main Features.......................................................................................... 3
2Specifications............................................................................................. 5
2.1 Specifications.......................................................................................... 5
2.2 Probe Types............................................................................................. 5
3User Interface............................................................................................ 6
4General Operations .................................................................................. 7
4.1 Connecting the probe/sensor................................................................... 7
4.2 Instrument connection with AC power................................................... 7
4.3 Instrument front panel display and touchpad.......................................... 8
5Instrument Calibration and Accuracy Adjustments .......................... 10
5.1 100 Ω calibration................................................................................... 11
5.2 25 Ω calibration..................................................................................... 14
6Selection of Sensors and Adjustment of Parameters .......................... 17
7Wireless Data Acquisition...................................................................... 23
8Using a Flash Drive (U disk) for Data Acquisition.............................. 29
9Using the USB Interface for Data Acquisition..................................... 33
10 Appendix: Installation of USB Driver.................................................. 36
11 Limited Warranty & Limitation of Liability....................................... 40
Please read the “Important Notice”information on
the next page before turning on this instrument!

AM8040 Precision Thermometer User’s Guide
Rev. 202206V1 2/40
Important Notice ---- Warning
Check the position of the “Measurement/Calibration
Switch” on the rear panel. Please refer to Figure 2. The
switch must be at the measurement (left) position. Loss
of calibration data will occur if the switch is at the
calibration (CAL) position when the instrument is used
in measurement application.
The instrument is calibrated before shipment. Only
qualified calibration agencies with proper standard
resistors should perform the calibrations of this
device. Please refer to 5. Instrument Calibration and
Accuracy Adjustments

AM8040 Precision Thermometer User’s Guide
Rev. 202206V1 3/40
1Introduction
The AM8040 precision thermometer is a desktop temperature
measurement and calibration device. It can work together with various
types of platinum resistance thermometer (PRT) sensors. The measured
temperature is calculated by the embedded microcontroller following
the ITS-90 standards or the CVD conversion method. This precision
thermometer has strong data acquisition capability. Users can acquire
and record data using an USB cable connecting to a PC, or using a Flash
drive with the simple ‘plug-and-record’ function. Alternatively, it can
work with an optional wireless module to acquire and record data
remotely through wireless. With these flexible peripherals, temperature
data can be captured and saved in real-time easily for various
applications.
1.1 Main Application
Temperature calibrations or precision temperature
measurements.
Works with Standard Platinum Resistance Thermometers
(SPRTs), Secondary Platinum Resistance Thermometers
(Secondary PRTs) and Precision Industrial Platinum
Resistance Thermometers (IPRTs).
Wireless/wired/flash real time temperature measurement and
acquisition.
1.2 Main Features
High accuracy: up to ±0.008ºC at 0ºC.
High resolution: 0.001ºC
Concurrent platinum sensor temperature measurement and data
capturing.

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Concurrent display of sensor’s temperature in Celsius ºC,
Fahrenheit ºF, and resistance Ω.
2.7” OLED display.
Touchpad for function control.
Flexible sensor parameter adjustment and setting.
USB interface to computer for real-time temperature capturing
and data saving.
Wireless real-time temperature data capturing with optional
external wireless module.
Real-time temperature data capturing and saving to a flash drive.

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2Specifications
2.1 Specifications
Model
8040
Temperature Range
-260°C to 850°C
Accuracy (meter only)
±0.01°C at -200°C
±0.008°C at 0°C
±0.009°C at 232°C
±0.01°C at 420°C
±0.015°C at 660°C
Resolution
0.001°C (0.0001Ω) over full range
Probe
Nominal Rtpw: 25 Ωor 100 ΩRTD, PRT or SPRT
Characterizations
ITS-90 coefficients, Callendar-Van Dusen coefficients, IEC-751 (DIN 385)
Sample Interval
1 second
Display
2.7 inch OLED
Display Units
°C, °F, Ω
Excitation Current
1 mA, reversing
Operation Range
15°C to 35°C
Thermometer Input
Connectors
Spade plug, banana plug or bare wire
Power Requirements
100-240V
Dimensions
180mm (W) x 65mm (H) x 200mm (D)
Weight
0.3 kg (0.7 lbs)
2.2 Probe Types
SPRT or PRT with temperature coefficient α=0.003925
(WGa ≥1.11807).
IPRT with temperature coefficient α=0.00385.

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3User Interface
Front Panel:
Flash Drive Wireless USB Sensor Main Menu Flash Drive
Status Status Status Type Key Recording
Start/Stop Key
Main Display Left Key Parameter Return
Adjust Key /Right Key
Figure 1: Front Panel
Rear Panel:
AC Power Inlet & Switch Sensor terminals
Flash Drive USB Measurement/Calibration Switch
Interface Interface
Figure 2: Rear Panel
Warning：Unless calibration
is needed do NOT put the
switch on ‘Cal’.

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Rev. 202206V1 7/40
4General Operations
AM8040 is a high accuracy digital thermometer working with a four-wire
platinum resistance thermometer (PRT) sensor.
The details of AM8040 operations are shown as follows:
4.1 Connecting the probe/sensor
The four-wire sensor should be connected to the “Sensor” terminals
at the rear panel. Figure 3 shows how the four wire sensor should be
connected.
It should be noted that the “Measurement/Calibration” switch
should be at the “Measurement” position.
Measurement/Calibration Switch
Figure 3: Rear Panel and Sensor Terminals
4.2 Instrument connection with AC power
AM8040 must be used with power of AC100V~240V.
Pair
ors
Pair
ors

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4.3 Instrument front panel display and touchpad
After power is on and a sensor is connected, AM8040 shows some
initialization information, and then displays information including
the instrument’s interface status, measured temperature in Celsius
degree, the sensor resistance and temperature in Fahrenheit degree.
These are shown in 4 lines as in the following figure:
Udr ZB-xx USB
+130.734
t= IPRT
C
Rt= 150.1074
ohm
t= +267.321
F
Line 1
Line 2
Line 3
Line 4
There is a status sign which blinks at the upper left corner of the
LCD display functioning as a status indicator. The status sign blinks
when the device is powered on.
Line 1 is the instrument’s interface status, including USB flash drive,
wireless communication status and USB to computer interface status.
If “Udr” is displayed, it means that a flash drive is connected to the
Host USB interface; if “ZB-xx” is displayed, where “xx” are
numbers, it means Zigbee wireless data capturing is working; if the
display shows “USB” on the top line, it informs the user that
AM8040 is connected to a computer’s USB interface.
The “t=” at Line 2 shows the measured temperature of the sensor.
The “IPRT” at the end of Line 2 tells the type of sensor. AM8040
supports two types of sensors. “SPRT” indicates a 25Ω or 100Ω
standard platinum resistance thermometer with α=0.003925. “IPRT”

AM8040 Precision Thermometer User’s Guide
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indicates a 100Ω industrial platinum resistance thermometer with
α=0.00385. The “C” is displayed at end of Line 2, it means the
temperature is measured in Celsius degrees.
Line 3 shows the sensor resistance. Line 4 shows the temperature in
Fahrenheit degrees.
AM8040 has three display pages of the measured data and these
pages can be scrolled to show different information. The above
example is page 1. The third page shows the resistance of the sensor.
The second page is the combination of page 1 and page 3. Users can
scroll up and down through these three pages by pressing the or
keys.
The menu key
MENU
and return/right shift key can be used for
sensor selections and parameter adjustments. The flash drive
recording start/stop key
REC
can be used for data saving to a flash
drive. The details are in 5. Instrument Calibration and Accuracy
Adjustments and 6. Selection of Sensors and Adjustment of
Parameters.

AM8040 Precision Thermometer User’s Guide
Rev. 202206V1 10/40
5Instrument Calibration and Accuracy Adjustments
AM8040 is designed for accurate temperature measurements by
measuring the sensor resistance and converting it to temperature.
Consequently, the resistance measurement is very critical and the
instrument must be calibrated correctly. Every AM8040 is calibrated
before shipment.
Users can calibrate AM8040 using standard resistors with calibrated
values. A one year calibration interval is recommended.
Warning: It is required to set the correct R0 or Rtpw value of the sensor
before calibrations. To calibrate AM8040 in the range from 10 Ω to 50
Ω, R0 or Rtpw needs to be set to 25 Ω. To calibrate AM8040 in the range
from 50 Ω to 375 Ω, R0 or Rtpw needs to be set to 100 Ω.
The calibration should be done in an environment with a room
temperature of 22 ±2°C.

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Instrument calibration procedure: (No special sequence for
100 Ωand 25 Ω calibrations)
5.1 100 Ω calibration
5.1.1 Turn off the power, put the measurement/calibration switch to
the “CAL”side (right side). Please see Figure 4 for details.
Figure 4: Calibration Configuration at Rear Panel
5.1.2 Turn on the power. After initialization, AM8040 shows the
calibration main menu. There are two calibration selections: 100
Ohm CALIBRATION and 25 Ohm CALIBRATION. The
following is an illustration of the 100 Ohm CALIBRATION.
* CALIBRATION MENU *
> 100 Ohm CALIBRATION
25 Ohm CALIBRATION
Enter = Yes
-------------------------------------------
5.1.3 Use the or keys on the key pad to select the calibration.
A “>” sign is displayed in front of the selected line. For example,
Switch to “CAL” side
before calibrations.

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the above figure shows that 100 Ohm CALIBRATION is
selected. Pressing the key will start the calibration program,
and the following display will appear:
* 100 Ohm CALIBRATION
Connect a 100 Ohm
Standard Resistor
and Press Enter
Menu= Exit Enter = Yes
-------------------------------------------
5.1.4 The instrument will show “Connect a 100 Ohm Standard
Resistor and Press Enter” to indicate that a 100Ω resistor must
be connected first. Users can exit the calibration by pressing the
MENU
key to go back to the main menu (*CALIBRATION
MENU*).
5.1.5 After the sensor is correctly connected, press the key to
start the calibration. The instrument will display “Waiting…”
for a few seconds and should display some values as follows:
* 100 Ohm CALIBRATION
100.0238
Rt = 111.0000 OHM
Menu= Exit <^v>=Adj
100R Rs = OHM
5.1.6 To calibrate the instrument, users must adjust the value at the
third line (100.0238 as shown above) to match the standard

AM8040 Precision Thermometer User’s Guide
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resistor’s resistance. For example, if the resistance of the
standard resistor is 100.0038ohm, users can move the underline
cursor to the position where the value will be adjusted by using
the and keys, and users can adjust the value by using the
and keys. The following picture shows the adjusted
result.
* 100 Ohm CALIBRATION
100.0038
Rt = 100.0038 OHM
Menu= Exit <^v>=Adj
100R Rs = OHM
5.1.7 It is required to wait for 15 to 20 seconds before the data are
stable. The next step is to save the calibrated data to the
instrument. To save the data, press the
MENU
key, and the third line
data will blink showing the option to save.
5.1.8 To save this calibration value, press and hold the key and
then press the key at the same time. This operation will store
the calibration data to the instrument, and the program will go
back to the main menu (*CALIBRATION MENU*). If users
DO NOT want to save the data, press the
MENU
key and the display
page will go back to the main menu (*CALIBRATION
MENU*).

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5.2 25 Ω calibration
5.2.1 The process of 25 Ω calibrations is similar to that of 100 Ω
calibrations. First, turn off the power of the instrument and
ensure the measurement/calibration switch at the rear panel is set
to the “CAL” side (right side), as shown in Figure 4. Turn on the
power.
5.2.2 Choose 25 Ohm CALIBRATION under the main menu
(*CALIBRATION MENU*) by pressing the or keys to
move the “>” cursor to the “25 Ohm CALIBRATION” line:
* CALIBRATION MENU
100 Ohm CALIBRATION
> 25 Ohm CALIBRATION
Enter = Yes
-------------------------------------------
5.2.3 Press the key to start the program of 25 Ohm
CALIBRATION. The instrument will show:
* 25 Ohm CALIBRATION
Connect a 25 Ohm
Standard Resistor
and Press Enter
Menu= Exit Enter = Yes
-------------------------------------------

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5.2.4 Follow the “Connect a 25 Ohm Standard Resistor and Press
Enter” instruction to connect a 25Ω to the sensor terminals. A
standard resistor of 25Ω must have a value close to 25Ω;
otherwise the calibration will not be accurate.
5.2.5 Press the key to start the 25Ω calibration. The instrument
should display “Waiting…” for a few seconds and then show:
25.9977
Rt =25.0000 OHM
Menu= Exit Enter = Yes
25R Rs = OHM
* 25 Ohm CALIBRATION
The value on the third line is the parameter to be adjusted and
this value must match the standard resistance of the 25Ω
resistor. For example, the above figure shows the current value
of 25.9977, but the standard resistor’s value is 24.9977. This
value can be adjusted by using the or keys to move the
“_” to the position where the value will be tuned, and using the
or keys to adjust the value. After the adjustment, the
instrument should display:
24.9977
Rt =24.9977 OHM
Menu= Exit Enter = Yes
25R Rs = OHM
* 25 Ohm CALIBRATION

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5.2.6 It is required to wait for 15 to 20 seconds before the reading is
stable. The next step is to save the calibrated data to the
instrument. To start the data saving, press the
MENU
key, and the
third line data will blink to indicate the option to save.
5.2.7 To save this calibration result, press and hold the key and
then press the key at the same time. This will save the
calibration data to the instrument, and the program will go back
to the main menu (*CALIBRATION MENU*). If users DO
NOT want to save the data, press the
MENU
key and go back to the
main menu (*CALIBRATION MENU*).
Switch setting after calibration
After the calibration, turn off the AC power;
Set the Measurement/Calibration switch at the rear panel to
the left side (away from “CAL”)

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6Selection of Sensors and Adjustment of Parameters
AM8040 can work with different types of PRT probes/sensors. It allows
users to select probe types and input the parameters of the probes.
The probes compatible with AM8040 are:
25 Ω or 100 Ω standard SPRTs, or
25 Ω or 100 Ω secondary reference PRTs, or
100 Ω IPRTs.
The temperature coefficient of these sensors can either be 0.00385
Ω/Ω/°C or 0.003925 Ω/Ω/°C.
The sensor types working with AM8040 are classified and named as
IPRT and SPRT:
If the probe is an industrial or precision platinum resistance
thermometer probe with a temperature coefficient of 0.00385
Ω/Ω/°C, AM8040 will categorize the probe as “IPRT”. AM8040
will calculate temperature according to the CVD (IEC751)
method.
If the probe is an SPRT, or a secondary PRT with a temperature
coefficient of 0.003925 Ω/Ω/°C (WGa>=1.11807), AM8040 will
categorize the probe as “SPRT”. AM8040 will calculate the
temperature according to the ITS-90 formula.
Steps to select sensor type and input parameters:
1. Under normal working state after powering on, press the
MENU
key
and then press the key within 3 seconds. AM8040 will go to
the parameter adjustment main menu, and the display will show:

AM8040 Precision Thermometer User’s Guide
Rev. 202206V1 18/40
* MAIN MENU *
> Sensor Setting
U-Drive Setting
Wireless Setting
---------------------------------------------
MENU=Quit ENTER=Yes
There are three options at this step:
i. Sensor Setting. This is for sensor parameter adjustments.
Users can select sensor type and do parameter adjustment.
ii. U-Drive Setting. Users can select data saving rate to an
external flash drive.
iii. Wireless Setting. Users can select wireless communication
settings (optional).
2. Press the or keys to move the highlighter line with “>” to
“Sensor Setting”. Press the key to enter the Sensor setting
adjustment program as shown below. The sensor type can be
“IPRT” or “SPRT”. Users can select either one by moving the “>”
to the sensor type, and then pressing the key. Users can exit
this selection screen by pressing the
MENU
key. The figure below
shows that the SPRT sensor type is selected.
[SENSOR SETTING]
IPRT
---------------------------------------------
MENU=Exit ENTER=Yes
SENSOR = SPRT
>SPRT

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3. Press the key to go to the parameter adjustment menu:
[SPRT SETTING]
SET a
---------------------------------------------
MENU=Exit ENTER=Adj
>SET Rtp
SET b
SET c
SET a4
SET b4
4. If the type of sensor is an SPRT, the adjustable parameters are Rtp,
a, b, c, a4 and b4. The details of these parameter definitions can be
found from ITS-90.
As an example, calibration agencies provide the following
parameters after an SPRT is calibrated:
Rtp: probe’s resistance at the triple point of water.
a4 and b4: low temperature range parameters.
a, b and c: high temperature range parameters (c can be “0” in
some instances. Please refer to ITS-90 for more information.)
5. If the sensor type is IPRT, the adjustable parameters are R0, A, B
and C.
[IPRT SETTING]
SET A
---------------------------------------------
MENU=Exit ENTER=Adj
>SET R0
SET B
SET C