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 2 added 343 characters in body edited Dec 16 '16 at 23:36 user132236 Voltage in R1 is kept at 64 mV/298K. (From datasheet) Thus, at room temperature (~298 K), you'll get 64 mV at R1: I = 64 mV / 33 Ohm = ~ 2 mA So you should see 2mA drawn from your battery. As a side note, using a bad multimeter in ampermeter mode is not a good idea. You have way too high series resistance. Instead of that, just measure the voltage on R1 and see if it's actually ~64mV. If you really really need to use the multimeter in ampermeter mode, - Take multimeter in ampermeter mode - red wire to Vbat "+" terminal - Black wire to "V+" of LM 334Z - of course delete the current wiring between the to shown in the picture edit: As pointed out in comments, the multimeter is in voltmeter mode (shown in picture). Voltage in R1 is kept at 64 mV/298K. (From datasheet) Thus, at room temperature (~298 K), you'll get 64 mV at R1: I = 64 mV / 33 Ohm = ~ 2 mA So you should see 2mA drawn from your battery. As a side note, using a bad multimeter in ampermeter mode is not a good idea. You have way too high series resistance. Instead of that, just measure the voltage on R1 and see if it's actually ~64mV. Voltage in R1 is kept at 64 mV/298K. (From datasheet) Thus, at room temperature (~298 K), you'll get 64 mV at R1: I = 64 mV / 33 Ohm = ~ 2 mA So you should see 2mA drawn from your battery. As a side note, using a bad multimeter in ampermeter mode is not a good idea. You have way too high series resistance. Instead of that, just measure the voltage on R1 and see if it's actually ~64mV. If you really really need to use the multimeter in ampermeter mode, - Take multimeter in ampermeter mode - red wire to Vbat "+" terminal - Black wire to "V+" of LM 334Z - of course delete the current wiring between the to shown in the picture edit: As pointed out in comments, the multimeter is in voltmeter mode (shown in picture). 1 answered Dec 16 '16 at 23:29 user132236 Voltage in R1 is kept at 64 mV/298K. (From datasheet) Thus, at room temperature (~298 K), you'll get 64 mV at R1: I = 64 mV / 33 Ohm = ~ 2 mA So you should see 2mA drawn from your battery. As a side note, using a bad multimeter in ampermeter mode is not a good idea. You have way too high series resistance. Instead of that, just measure the voltage on R1 and see if it's actually ~64mV.