Instructions HAFF Digital - Planimeter

for Polar-Planimeter No. 330E and Roll-Planimeter No. 331E
(partly for Typ 350 / 351 too)

Contents:

Components 1. Housing 2. Tracing arm 3. Tracing lens 4. Pole plate 5. Pole arm 6. Socket for charger lead and data output 7. Measuring wheel 8. Test area (under the foam packing in the box) 9. Roller

Display 000000 digits of the measurement 1: 1 cm² scale, with units M memory in use - value in memory is negative (only possible with HOLD M-)  E error - measuring beyond the range (max. 2700 cm² at 1:1) Bat battery low - needs recharging CCCCCC ready to calibrate - see Section 8 mm2 c m2 m2  ha km2    units in the metric system sqmiles acres sqfeet sqinch    units in the imperial system -   first measurement for average value =  second measurement taken, this is the average of the two 3 lines    third measurement taken, this is the average of the three

ON power supply OFF power supply START standby for measurement (before each measurement) display: 000000 HOLD M+ the measured value is stored in the memory HOLD M- the measured value is stored in the memory, negatively MR/MC press once = memory recall press twice = memory clear SCAL/AV programmed, fixed scales are recalled in sequence and SCAL/AV after "START" and measurement, the average of 2 or 3 readings         M/E the metric or imperial (feet and inches) system can be selected UNIT 2 units for each scale can be selected CAL calibration of the planimeter for the working source document used PROGR. framed red lettering for entering the variable scale ratios, using: SELECT to select the figure to be set VALUE to set the value of the figure POINT to position the decimal point CAL and ME/PROGR. can only be operated with a pencil point, or similar, to avoid accidental actuation. "Tone" on pressing a button which has a "live" function ------   measurement lost after 1 minute without movement (start again with ON - see Section 15)

1) Brief description for those in a hurry

Measurement is only possible with charged batteries and a properly calibrated planimeter (Section 8)

1. mark the starting point on the boundary of the area
2. set the planimeter to the starting point
3. press the "ON" button
4. press the "START" button
5. trace right round the boundary until you reach the start again
6. read the result

2) General description

The HAFF Electronic Digital-Planimeter has been manufactured with great care using the latest technology and to the very highest standards.
Although it is easy to operate please take the trouble to read these instructions carefully. They explain the various measuring facilities and studying them will ensure that you get the best service from the instrument.

3) Before measuring

Check the state of the battery - "Bat" might not be displayed
The work table should be horizontal and the working surface on which the measuring wheel is to run should be clean and unbroken.
The pole arm (5) - or the roller (9), and the tracing arm (2) should be approximately at right angles when the tracing lens (3) is in the centre of the area to be measured.
Mark the start/finish point on the boundary.
Position the centre of the tracing lens accurately over the starting point.

4) Measuring

Using the tracing lens (3), trace the boundary of the area so that the small ring in the centre deviates as little as possible from the line.
The measurement will always be positive whether you trace round in the clockwise or anticlockwise direction.
See Section 6 for information on the measuring process..

5)Accuracy

The planimeter is a highly sensitive instrument and must be handled carefully.
Because the measuring wheel is designed to move extremely easily it is mounted in very special bearings which must not be subject to compesssion or shock.
The measuring accuracy of the instrument is ± 0,1 cm² at a scale of 1:1.
Human measuring errors can be reduced by taking the average of up to three readings - see Section 7. Errors resulting from the work surface can be reduced by calibration - see Section 8.

6) Normal measurement

Several areas can thus be added and subracted. A large area which would exeed the measuring range can be subdivided and the total area found by putting the parts into the memory.

The maximum display capacity is: 999999.

7) Average value - SCAL/AV

To reduce human error, the average of 2 or 3 readings can be found.

The "average indicator" (1, 2 or 3 lines) will not be displayed if all 6 digit are used for numbers!

8) Calibration

The planimeter is mechanically adjusted and electronically calibrated.
The user can calibrate the planimeter to match the working surface in use by means of the test area (8) supplied.
For greater accuracy in the calibration, trace round the test area twice, or even three times.
Tracing completely round the area corresponds to an area of precisely 100.0 cm². The automatic calculation in the planimeter is always based on a scale 1 : 1 in the metric systems no matter what scales are in use. The appropriate factor obtained by using the test area is calculated and stored when the CAL button is pressed.

This ensures that all subsequent measurements made on this document, at any scale, can be made accurately.

a) Calibration for distorted drawings

1st possibility: e.g. If the following values are produced by measuring the drawing:

Calibration measurement on the drawing using the test area (as above) C 0980
Corrected calibration 980 x 1,02 x 0,96 = 960 to three figures (with calculator).
Set the required factor by moving the display to C 0960 einstellen. Store the calibration factor by pressing the CAL button.

2nd possibility:

Plotting a required area on this surface of 100 cm² with a distorted scale:
e.g. 10,2 cm x 9,6 cm. Calibration as described in Section 8, but by tracing round this drawn area, rather than round the test area.

b) Calibration on the basis of a given area

Calibration using the test area gives a value of C 0980.
The correct size of the area is known to be e.g. 58,0 cm².
Measuring the area gives a value of 60,0 cm².
The calibrating value C = 60x980 /58 = 1014
Set the required factor by moving the display to C 1014. Store the calibration factor by pressing the CAL button.

9) Selecting the system of units: metric or imperial

After "OFF",  hold the M/E button down and press the ON button. Release the M/E button when all the segments of the display appear..
The system of units is clear from the display - cm² etc. or sqinch etc.

10) Scale selection

The actual area is calculated electronically in the planimeter depending on the scale in use
The following scales are permanently stored:.
Metric 1:  1/ 2/ 2,5/ 5 mm² or cm²,  1: 10/ 20/ 50/ cm² or m²,  1: 100/ 500/ 1000/ 2500/ 5000 m² or ha,  1: 10000/ 25000/ 50000/ ha or km²
free - see Section 11
Imperial  1:1/ 4/ 12/ 16/ 24/ 48/ 96/ 120/ sqinch or sqfeet,  1: 792/ 1200/ 1250/ 2400/ sqfeet or acres,  1: 39600/ 7920/ 63360 acres or sqmiles
free - see Section 11

Keep pressing the SCAL/AV button until the required scale appears.

11) Programmable scales

Any scale ratios can be stored after the fixed ratios shown in Section 10. 
Possible ranges:

Metric 1: 0,01 to 9,99 mm² or cm²,  1: 10,00 to 99,99 cm² or m²  1: 100 to 9999 m² or ha  1: 10000 to 999900 ha or km².
Imperial 1: 0,01 to 120,0 sqinch or sqfeet, 1: 120,1 to 2400 sqfeet or acres, 1: 2401 to 999900 acres or sqmiles.

Programming e.g. Scale 1:654,3 m²

Up to 6 places can be entered, but only the first 4 places can be changed

12) Unit selection - UNIT

2 adjacent units can be selected at will. The measurement will automatically shift to the upper unit if the measurement overflows the display using the lower unit.

13) Battery monitoring

The symbol "Bat" indicates that the battery will soon need recharging.

14) Battery charger

The charged battery will allow 30 hours continuous operation.

Charging:

1. Switch off the planimeter.
2. Plug the charging lead into the socket (6) at the rear of the housing.
3. Connect the charger to a 230 V AC power supply.
4. Charge a completely flat battery for about 15 hours and pro-rata for partially discharged ones.
   Do not overcharge as this will shorted the life of the battery.
5. Disconnect the charger from the mains.
6. Disconnect the lead from the planimeter.

15)Care of the battery

The power supply is switched off after 1 minute if the measuring wheel is not moved and the display shows ----- .You can restart by pressing the ON button.
If no buttons are pressed, the display will switch off after 5 minutes. Any measurements which have not been stored in memory will then be lost. The other values such as calibration factor, variable scales and memory contents are retained.

16) Measuring range

At a scale of 1:1 the maximum area per measurement is 2700 cm²
If this is exceeded the error message E will appear in the display. 
In this case divide the area into smaller parts and put them into memory as they are measured.

17) Display range

= 999999

18) Incorrect operation

If you make a mistake when tracing, start again by pressing START.
If you press the wrong button, start again by pressing ON.
Do not use the instrument with the charger connected.

19) Data output RS 232

Socket no. 6 is used for the charger lead and data output using the interface no. 322.
After pressing the Hold M+, Hold M- or the MR/MC button the measuring data will be transmitted to the excel spreed sheet of a computer.

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