7. Guarantee & S ervicing ..................................................................................... 20
All Time Electronics' instruments are subject to continuous development and improvement and in
consequence may incorporate minor detail changes from the information contained herein.
1090 Technical ManualPage | 2
3
1. General
The 1090 is a high performance instrument designed for use in both the lab and field. It
simulates and can measure from the most commonly used temperature sensors thermocouples (8 types) and PT100.
In addition it can generate and measure mV and mA.
Display is via a large, easy to read, 16 character LCD screen.
The user interface is simple and intuitive.
Increment and Decrement (Inching) keys enable the output to be stepped up or down in 0.1,
1 or 10º C steps, and 0.1,1 or 10 uV/mV/mA.. This feature is especially useful for calibrating
thermostat type controllers with hysteresis.
Automatic or manual cold junction compensation can be selected and applied.
Up to 10 frequently used output values can be stored in the non-volatile memory. These can
be re-called at any time and stepped through either manually or automatically.
The 1090 is supplied in a robust case with a carrying strap. A pocket for this manual and
test leads is provided. Full operation, including re-charge, is possible without removal from
the case. The lid is reversible to simplify operation.
The 1090 is powered by a 5000mA Ni-MH battery pack; this will give a maximum operation
time of around 60 hours (depending on functions used). It is important not to over-charge
the battery pack, as this could lead to a shortened life; see section 4.1, page 13.
1090 Technical ManualPage | 3
2. Front Panel Controls
A B C
E
F
G
H
I
J
K
L
M
N
P
Q
R
S T U
V
X
Y
W
D
4
Keypad Primary and Secondary functions
Most of the 1090’s keys are dual function. Their primary function is shown in blue on the
lower half while the secondary function is shown in red, on the upper half. To access the
secondary functions press the ‘SHIFT’ key before the required secondary function key. The
display indicates when the ‘SHIFT’ key has been pressed by showing an ‘S’ on the right
hand side. This mode is always cancelled after the secondary function is selected, or the
‘CLEAR’ is pressed.
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5
Secondary functions are shown i n [ ]
A 4mm Output Terminals
B 4mm Input Terminals
C Chassis earth connection
D 16 digit Liquid Crystal Display
E Increments output in accordance with user set resolution
F Decr em ents output in accordance with user set resolution
[Turns unit off]
G [Selects Type S thermocouple]
H [Selects Type R thermocouple]
I [Selects Type K thermocouple]
J [Selects Type J thermocouple]
K [Selects Type B thermocouple]
L [Selects mV]
M [Selects mA]
N [ Select s uV]
P In source mode recalls values stored in memory
[Stores values in memory]
Q Steps to the next stored value
[Auto steps]
R [Selects Type T thermocouple]
S Allows menu functions to be viewed and changed
[Toggles the temperature readout between
o
C and oF]
T [Selects Type N thermocouple]
U [ Select s Source or Measure]
V [Selects Type E thermocouple]
W Clears value
X Enters an output value.
[Selects PRT (RTD) mode]
Y Sets keypads to secondary (RED) functions
Note: The secondary keypad functions are available only when relevant to the selected
operating mode eg ’Auto Step’ is not available when the 1090 is in measure mode.
Also please note that the ’SHIFT’ mode has an automatic time out. This means that it will
automatically be cancelled if the secondary function is not selected within a few seconds.
1090 Technical ManualPage | 5
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3. Operating Ins truction
3.1. Turning the unit On/Off
To Turn On
The unit is powered up by pressing and holding any key for longer than 1 second. On
power-up, the software version and (mV/mA/Pt) will be displayed for 2 seconds. The battery
voltage is then checked and if below 6.5V a ‘Battery Low’ warning is displayed.
If below 6.0V a ‘Battery Dead’ warning appears and the unit powers down.
The unit then goes into its default start mode, Measure mV
To Turn off
The unit is powered down by pressing ‘SHIFT’ followed by ‘OFF’ key.
Cold Junction Temperature Compensation
Automatic or Manual Cold Junction Temperature Compensation may be applied. On power
up the unit defaults to Auto CJ status.
To change to Manual press the ‘MENU’ key followed by the up and down arrows until the
display indicates step:
3) CJ Aut o xxx
o
C
Press the ‘ENTER’ key. The unit switches to manual and is ready to accept a manual figure
entered from the number keys. The unit remains in the CJ Manual mode until it is turned off.
Note: Setting Cold Junction Compensation in degF requires the unit to be in degF units
before entering the menu.
3.2. Thermocouple Measures
When the unit is turned on it displays the software version number and then enters its
default mode (mV measure) and displays
Meas 0.00mV
Connecting the Thermocouple
Connect the thermocouple cable or compensating cable to the 1090’s input terminals.
Thermocouple Selection
Select the type of thermocouple that you wish to measure by pressing the SHIFT’ key
immediately followed by the thermocouple type. e.g. SHIFT then J to select type J. The unit
will indicate type and temperature. The display will then show:
o
Meas Ja 23.9
C
The ‘a’ following the J indicates that the unit is set for automatic cold junction compensation.
If automatic cold junction compensation is not required, it should be disabled using the menu
set-up. See section 3.1.
The display may be toggled to show in degF or degC by pressing ‘SHIFT’ then the ‘
oC/o
F’ key.
Note: If required, the actual thermocouple output voltage in mV can be shown by pressing
and holding down the ‘ENTER’ key.
For CJC operation see 3.1
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