Specifications
18
F. Continue as necessary.
When Recall , Send ,
X
is pressed, the printer will print the total weight, min, max, mean, number of samples, standard
deviation, and coefficient of variation (coefficient of variation is equal to the standard deviation divided by the mean and is
therefore a measure of dispersion). Finally the printer prints a blank line for your signature as well as the time and date.
You cannot add additional population data to your statistics run as the keyboard automatically clears all statistics registers.
Note: if the total weight value is larger than the capacity of the balance, an overload (OL) will print for the total weight
value. However all other values will be printed correctly.
To return the balance to normal operating mode, press C .
ISO Calibration Test - (must have RS232 printer connected to the balance)
The balance, prompted by the attached keyboard, will provide a hardcopy calibration printout on an attached RS232 printer.
This is accomplished by the following procedure:
1. Activate the balance time/date stamp using the 24 hour clock.
Example: If the time is 3:32:21 p.m., press 153221, Enter , 101 , Store . Register 101 is the time stamp.
If the date is September 12, 1998, press 091298 , Enter , 100 , Store . Register 100 is the date stamp.
The time/date stamp will remain current until the balance power is interrupted. If power interruption occurs, reset the time
and date. To check the time or date stamp to see if it is set properly, press 100 , Recall or 101 , Recall on the keyboard.
2. Calibrate the balance (see Autocalibration section) using a recently certified external calibration weight which has a NIST
traceable calibration certificate. Metrology handbooks state that the calibration weight utilized to calibrate a balance should
have a tolerance no larger than the readability of the balance divided by 4. Therefore, SA models need a ±0.025mg
tolerance weight or better, SP models need a ±0.25mg tolerance weight or better, SL models need a ±2.5mg tolerance weight
or better, and SG models need a ±25mg tolerance weight or better. In addition, these same handbooks recommend that all
balances be calibrated using an external certified calibration weight even if the balance has an internal calibration weight.
3. Press Conv , Cal on the keyboard.
4. A printout begins showing the balance model and serial number, time, and date. Then the printer pauses. It is waiting for
you to manually input into the keyboard the nominal weight of the calibration weight to the same readability of your balance
model.
Example: If the calibration weight you used to calibrate the balance is a 100 gram weight and the balance model has a
readability of 0.1mg, the target weight of your calibration weight should be 100.0000 grams (nominal). To
enter the target weight, press 100.0000 , Enter . The printer will then print this target weight and “Target Wt”
on the printout. All target weights entered should be either 50.0000, 100.0000, 200.0000, 500.0000, 100.000,
200.000, 500.000, 1000.000, 200.00, 500.00, 1000.00, 2000.00, 5000.00, 2000.0, and 5000.0.
5. The printer then pauses. It is waiting for your to place the calibration weight on the pan.
6. Press Tare to get a good zero point before weighing.
7. Place the cal weight on the pan, wait for a stable reading, and press Enter .
8. The printer will now print “Actual Wt” and the actual weight that the balance detects. It will also print the difference
between the target weight and actual weight. The printout will finish by printing a blank line for your signature as well as
the time and date.
(Note: Since you are manually entering the target weight as the nominal weight of the calibration weight, and not the actual
weight, the “Diff” shown on the printout is the difference between the nominal weight and the weight detected. This is one
reason why the calibration weight being used must have a tolerance equal or better than the readability of the balance divided by
4 as stated above.)
To return the balance to normal operating mode, press C .
Automatic Periodic Send
Data can be sent automatically at selected time intervals from once every second to once every 23 hours, 59 minutes, 59 seconds
to an RS232 printer or a computer. In order to enable this feature, you must have the AUTO SEND SELECTION, as described
in the RS-232 Front Panel Configuration section, turned ON. The procedure for setting the automatic periodic send is:
1. Enter the desired time interval using the numeric keys on the keyboard and store the interval in register 89.
Example: To send display information to a printer every five minutes, press 000500 , Enter , 89 , Store .
To send display information to a printer every six hours, thirty minutes, thirty seconds; press 063030 , Enter ,
89 , Store .
2. To stop the automatic timed send once it is set, press 0 , Enter , 89 , Store .
If you desire the time and date to be sent with each automatic send, do the following:
1. Activate the balance time/date stamp using the 24 hour clock.
Example: If the time is 3:32:21 p.m., press 153221, Enter , 101 , Store . Register 101 is the time stamp.
If the date is September 12, 1998, press 091298 , Enter , 100 , Store . Register 100 is the date stamp.