Following the manufacturer’s instructions, lower the trigger.  Then, place the cable to be tested under the two anvils and  close the trigger (move it up). Movement of the trigger pushes  up the riser, which pushes the cable at right angles to the two  clamping points under the anvils. The force that is required  to do this is indicated by the dial pointer. As the sample chart  beneath the illustration shows, different numbered risers are  used with different size cables. Each riser has an identifying  number and is easily inserted into the tensiometer. Included with each tensiometer is a conversion chart, which is  used to convert the dial reading to pounds. The dial reading is  converted to pounds of tension as follows. Using a No. 2 riser  to measure the tension of a 5/32" diameter cable, a reading of  30 is obtained. The actual tension (see chart) of the cable is  70 lbs. Referring to the chart, also notice that a No. 1 riser is  used with 1/16", 3/32", and 1/8" cable. Since the tensiometer  is not designed for use in measuring 7/32" or 1/4" cable, no  values are shown in the No. 3 riser column of the chart.  When actually taking a reading of cable tension in an aircraft,  it may be difficult to see the dial. Therefore, a pointer lock  is built in on the tensiometer. Push it in to lock the pointer,  then remove the tensiometer from the cable and observe the  reading. After observing the reading, pull the lock out and  the pointer returns to zero. Another variable that must be taken into account when  adjusting cable tension is the ambient temperature of cable  and the aircraft. To compensate for temperature variations,  cable rigging charts are used when establishing cable tensions  in flight control, landing gear, and other cable-operated  systems.  [Figure 2-89]  To use the chart, determine the size of the cable that is to  be adjusted and the ambient air temperature. For example,  assume that the cable size is 1/8" diameter, which is a 7-19  cable and the ambient air temperature is 85 °F. Follow the  85 °F line upward to where it intersects the curve for 1/8"  cable. Extend a horizontal line from the point of intersection  to the right edge of the chart. The value at this point indicates  the tension (rigging load in pounds) to establish on the cable.  The tension for this example is 70 pounds. Figure 2-89.  Typical cable rigging chart.  Temperature (°F) Rigging load (lb) −70 −60 −50 −40 −30 −20 −10 0  10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 340 320 300 280 260 240 220 200 180 160 140 120 100 80 60 40 20 0 1/4 x 19 3/16 x 19 5/32 x 19$_{1/8}$ x 19 3/32 x 7 1/16 x 7 Cable size Design limit rig load 2-52